Here's an alphabetical list of stuff you can add to your Minecraft home. Don't forget to give me a diamond and to subscribe!

Green: Functional rooms

Red: Non-functional rooms

Blue: Multiplayer only

Pink: With mods only

A

Armory/Weaponry: A room to store all your weapons and armor. Display your finest armor with armor stands!

Art gallery: Build a museum to show off your paintings. Place some of your own art as well like statues, pixel art...

B

Bathroom: A room to wash yourself after a hard day of mining.

Bedroom: A room to place your bed in. Sleeping in a bed resets your spawn point to the last bed you slept in. Make sure your walls are 2 blocks wide or monsters will spawn in the bedroom. Building underground or in the sky will also prevent this.

Block museum: A museum containing every solid block in Minecraft.

Brewery: The room where you brew potions. This room needs a few brewing stands, some cauldrons and some chests with ingredients and potions.

Bridge: Build bridges to easily cross rivers near your home!

• Bridge designs: https://www.youtube.com/watch?v=vnwHLT7ph7Q 
  

Bunker: A room where you can flee to if some hostile mobs or players broke into your house. Make sure you can only open and close the bunker from inside. A bunker is made of a strong material like obsidian. Also there must be a crafting table, a furnace, a chest with basic items (food, tools, weapons, crafting materials...) and a bed. Place some torches to avoid monsters spawning inside.

C

Cactus farm: A cactus farm isn't that useful like other farms. However, cactus farms are easy to build and it's a good use for mob traps, walls or other defensive purposes.

• Automatic cactus farm: https://www.youtube.com/watch?v=rqBs44Ayb8Q
  

Carrot farm: A carrot farm in your base provides a valuable food source that keeps your hunger bar up. For farming methods see wheat farm (carrots can be harvested the same way as wheat).

Cat kennel: A small perk with all your cats and some chests with some raw fish. Don't forget to make the cats sit so they don't teleport to you when you're exploring.

Cocoa bean farm: Just cookies...

• Cocoa bean farming guide: http://minecraft.gamepedia.com/Tutorials/Cocoa_bean_farming 
  
• Automatic cocoa bean farm: https://www.youtube.com/watch?v=9t7LLQqEd0s 
  

Cow farm: Cows drop leather, used for armor, books and item frames, and drop raw beef. Cows can also be milked by using a bucket on it.

• Automatic steak farm #1: https://www.youtube.com/watch?v=GVauT2iYhb0 
  
• Automatic steak farm #2: https://www.youtube.com/watch?v=SIyFXqAJizo 
  

Crafting room: The basic room for a Minecraft house. A crafting room contains (obviously) a crafting table, at least 1 furnace and chests with the basic crafting materials. It's a good idea to make this room near you're mine, furnace room and storage rooms.

Chicken coop: A chicken coop provides a source of eggs. Throwing eggs on the ground will have a 1/8 chance to spawn a chicken. After you have 2 chickens, it is easier to breed them with wheat.

• Chicken farming guide: http://minecraft.gamepedia.com/Tutorials/Egg_farming 
  

Cobblestone generator: A cobblestone generator provides a safe and fast way to gather cobblestone, typically by mixing water and lava.

• Simple cobblestone generator (skyisland): http://www.youtube.com/watch?v=gC4EXCeW5mc
  
• Advanced cobblestone generator: https://www.youtube.com/watch?v=veEoiCxTjDM 
  

D

Dog Kennel: A small perk with all your wolfs and some chests with rotten flesh from zombies, because wolves can eat them without becoming sick. don't forget to make the wolves sit so they don't teleport to you when you're exploring.

Doorbell: When players want to visit you, they can push on a button to let a note block play a sound. You can make this even more sophisticated by making chimes or even a whole song that plays upon entering.

E

Elevator: Easy vertical transportation with the help of boats, minecarts, pistons etc.

• Elevator guide: http://minecraft.gamepedia.com/Tutorials/Elevators
  
• Simple piston elevator: https://www.youtube.com/watch?v=SmIz9xX6K78 
  
• Boat elevator: https://www.youtube.com/watch?v=xuGUJfZbdBs 
  

Enchanting room: This room should have an enchantment table and chests with your enchanted tools and weapons.

• Advanced enchanting room design: http://www.youtube.com/watch?v=hXnLGWh9cPA
  

Enderman farm: Enderman traps are best suited to the End because they spawn at a considerably higher rate there. They drop ender pearls.

• Enderman farming guide: http://minecraft.gamepedia.com/Tutorials/Enderman_farming 
  

Escape tunnel: If there are hostile mobs in your house, you can easily escape with an escape tunnel. It's always better to have more then one exit out of your house.

F

Fishing pool: A small lake of at least 2 blocks deep, 1 block wide and 7 blocks long for fishing purpose.

Furnace room: This room has more furnaces then a crafting room and some chests with all the ores you've gathered. You should certainly build this room near your mine entrance.

G

Garden: A garden to relax in with flowers, trees, hedges and maybe a small pond.

Gravel-to-flint room: Once you have many stacks of gravel, it can be useful to convert most of your gravel into flints. This is just a big empty room, which you fill with gravel. Keep replacing and destroying the gravel until it drops as a flint. This room may include a chest with shovels, as well as ingredients and a crafting table for quick production of arrows or flint and steel. An even faster way is to put torches below the flint blocks, which will break them.

Graveyard: Every time you die you make a new tombstone with a sign. The sign tells when, where and how you died.

H

Harbor: If you find yourself using boats in a general area often, making a dock or two is a good idea. They can help prevent your boats from drifting off into the ocean or slamming into a wall when you exit, thus breaking the boat. Dispensers can also be placed here and filled with boats for convenience.

Herobrine altar: An underground altar made out of Nether materials to worship the Herobrine and sacrifice pigs.

I

Ice farm: An easy way to gather ice.

• Ice farming guide: http://minecraft.gamepedia.com/Tutorials/Ice_Farming 
  
• Automatic ice farm: https://www.youtube.com/watch?v=tDHnJG9GvXg 
  

Incinerator: Get rid of unwanted items.

• Advanced incinerator: http://imgur.com/a/BUSEp 
  

Iron golem farm: An iron golem farm is an easy way to acquire loads of iron ingots (and less usefull poppies).

• Iron golem farming guide: http://minecraft.gamepedia.com/Tutorials/Iron_golem_farming 
  
• Automatic iron golem farm: https://www.youtube.com/watch?v=NkDAUJdxI98 
  

J

Jail: Lock up all those griefers!

K

Kitchen: Pretty useless, can be used to store food though...

• Kitchen furniture: http://minecraftfurniture.net/kitchen 
  

L

Library: A room with many bookcases. It's a great use for any excess sugarcanes and it can double as an enchantment room. You can store your self-written books here as well!

Light house: A tall tower with some sort of light source on the top means that you can see your base from a long distance away. Usefull if you go exploring a lot, your spawn point is a long way from your base or you have not made a bed yet.

M

Melon farm: Another valuable food source that keeps your hunger bar up.

• Automatic melon farm: https://www.youtube.com/watch?v=7w62ToZ7sfM 
  

Mine: A mine to get a source of ores and cobblestone. You can make the entrance to your mine in your furnace room or crafting room.

Minecart railway: A railway system to transfer quickly to all your different mines and bases.

Mob farm/grinder: The purpose of a mob farm is to automate and maximize the process of spawning mobs, killing them, and funneling the resulting items to a collection point.

• Mob farm designs: http://www.minecraftwiki.net/wiki/Tutorials/Mob_Farm
  

Music room: A room filled with noteblocks or a jukebox to enjoy melodies. Some cool songs build with noteblocks in Minecraft:

• Metallica, Nothing else mathers: http://www.youtube.com/watch?v=0GOfhY0qzOo
  
• Coldplay, Clocks (intro): http://www.youtube.com/watch?v=Kc11xs0ocDg
  
• Frozen, Let it go: https://www.youtube.com/watch?v=9jX6qiwczcE 
  

Mushroom farm: A big room with a flat floor. You can light your mushroom farm by torches or glowstone, placed on the ceiling, to prevent mobs from spawning. Just make sure that there are no places on the floor where the light level is greater than 12 so the mushrooms can spread themselves.

• Automatic mushroom farm: https://www.youtube.com/watch?v=mfxkab1cCTE 
  

N

Nether portal room: The room where you make the portal to the Nether. A chest with some exploring materials is always usefull.

Nether wart farm: No need to find another hidden nether fortress when you've build this farm!

• Nether wart farming guide: http://minecraft.gamepedia.com/Tutorials/Nether_Wart_farming 
  
• Automatic nether wart farm: https://www.youtube.com/watch?v=8kMjOiVGneo 
  

O

Obsidian farm: It's possible to farm obsidian on a safe way without wasting any lava!

• Obsidian farm: https://www.youtube.com/watch?v=oIwozXjlun4 
  

P

Pig farm: PORKCHOP!

• Automatic pig farm: https://www.youtube.com/watch?v=HPBKkbJdbdk 
  

Potato farm: More food! For farming methods see wheat farm (potatoes can be harvested the same way as wheat).

Pumpkin farm: A pumpkin farm in your base provides a source for pumpkins which can be used for Jack-O-Lanterns and to create snow golems.

• Automatic pumpkin farm: http://www.youtube.com/watch?v=2yJqIufFBJc
  

PVP arena: A big arena to fight with other players in MP.

R

Rabbit farm: Rabbits drop rabbit flesh and the rare rabbit leg which is an ingredient for the mundane potion and potion of leaping.

• Automatic rabbit farm: https://www.youtube.com/watch?v=lKHlphUxviA 
  

Race Circuit: Saddle your horse and race against your friends!

• Horse race: http://www.youtube.com/watch?v=VunQSoIfOHg
  
• Pig race: https://www.youtube.com/watch?v=r9Imr04EBFE 
  

Redstone lab: A laboratory is a large, clear, secure area where you can safely test designs without distractions. When building large projects with complicated parts, it can save you time and effort if you test the ideas first.

Roller coaster: You can make huge roller coasters with powered rails. Some examples:

• Rollercoaster #1: https://www.youtube.com/watch?v=NKLE1jO9gK4 
  
• Rollercoaster #2: http://www.youtube.com/watch?v=k7MS-QAouf4
  
• Rollercoaster #3: http://www.youtube.com/watch?v=wIvMLobqdRw
  
• Rollercoaster #4: https://www.youtube.com/watch?v=N5MinuYi8oU 
  

S

Security room: Afraid of the dark? Do you always check if your doors are closed? Fear no more with the SecurityCraft mod! Mines, laser tripwires, cameras and more!

• SecurityCraft download: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1291001-v1-7-4-1-securitycraft-keypads-retinal-scanners 
  

Sheep farm: A source of food and wool!

• Simple automatic sheep farm: https://www.youtube.com/watch?v=fZYgfmLCrek 
  
• Advanced automatic sheep farm: https://www.youtube.com/watch?v=BTSieOFzldk 
  

Snow golem defences: Snow golems throw snowballs at hostile mobs up to 10 blocks away. A large group of snow golems push the hostile mobs away, keeping them away from your house.

• Small turret: http://www.youtube.com/watch?v=fu3OdfR_iwc
  
• Defence guide: http://minecraft.gamepedia.com/Tutorials/Snow_golems 
  

Snow golem farm: An infinite source of snow!

• Snow farming guide: http://minecraft.gamepedia.com/Tutorials/Snow_farming 
  

Spleef arena: Spleef is one of the most popular minigames in Minecraft. Typically, Spleef games take place in a arena, or elevated surface which consists of a generally large platform of blocks. The platform is usually surrounded by a building for people to spectate. The goal is to destroy blocks on the platform near or under the opponent to cause them to fall. Those who fall from the platform lose the round, and can fall into a pit, lava, or many other cruel fates designed by the stadium constructors.

• Spleef variations: http://www.minecraftwiki.net/wiki/Spleef#Spleef_Variations
  

Squid farm: An excellent source for valuable ink sacs! 

• Squid farming guide: http://minecraft.gamepedia.com/Tutorials/Squid_farming 
  
• Simple squid farm: https://www.youtube.com/watch?v=VJ3qa72eiT4 
  
• Automatic squid farm: https://www.youtube.com/watch?v=xBpWiPUKCME 
  

Storage room: When your chests in the crafting room starts to overflow, you can make storage rooms. There are 2 types of storage rooms: an item storage room for items and a block storage room for blocks.

Stable: A place where you can keep your horses safe.

Sugarcane farm: Sugar cane is the only source of sugar and paper and must be planted on a grass, dirt or sand block that is directly adjacent to water. Sugar cane can be found in almost any biome except tundra, due to the low occurrence rate of open, unfrozen water.

• Automatic sugarcane farm: http://www.youtube.com/watch?v=dO0cqI_H_6w
  

Swimming pool: A big pool of water to swim in.

T

Toilet: A small room with a toilet. You can make a secret entrance in into your treasure room.

Treasure room: A room build with high value materials like diamond blocks or gold blocks with chests filled with your most valuable items.

Tree farm: Producing wood in your own base can eliminate a major reason for venturing in the dangerous outside. Make sure your farming room has a torch next to each sapling and has enough space upwards. A chest with axes, saplings, and spare wood can be helpful as well.

• Tree farming guide: http://minecraft.gamepedia.com/Tutorials/Tree_farming 
  
• Automatic tree farm: https://www.youtube.com/watch?v=UGWBWhPUGAk 
  

W

Wall: A defensive wall around your house to prevent hostile mobs reaching your house. Don't forget to make the wall higher then 4 blocks or make an overhang because spiders can climb 4 blocks high!

Watchtower: A tall tower to keep an eye on the surroundings.

Well: A well can be very usefull if there aren't any natural water sources nearby. 

Wheat farm: Wheat can be crafted into bread, and is a necessary ingredient for cake and cookies. So a wheat farm is quite important. For efficient farming, click the following links:

• Wheat/potato/carrot/... farming guide: http://minecraft.gamepedia.com/Tutorials/Crop_farming 
  
• Semi-automatic wheat farm: http://www.youtube.com/watch?v=XMmJMUg0xxM
  
• Full-automatic wheat farm: http://www.youtube.com/watch?v=fCmfr9qamG4
  
• Advanced full-automatic wheat farm: http://www.youtube.com/watch?v=Y226Lr7m5L8
  

Z

Zombie pigman farm: A source of rotten flesh and gold nuggets.

• Zombie pigman farming guide: http://minecraft.gamepedia.com/Tutorials/Zombie_pigman_farming