I have thought of some really good mod ideas but the problem is... i don't know one single thing on moding! so if your a good modder you should probably consider making these mods...

1. Gravel Into Flint (put gravel into a furnace to cook it up into 1 piece of flint for a easier way to get flint to make arrows)

2. Stone Boat (made like a regular wooden boat except with stone (not cobblestone) and it is able to float in lava without taking any damage to yourself)

3. Mob Controller (makes it so you can put a saddle on any other animal and actually controll it the same way you walk)

4. Anvil (repair your tools and armor (example: to repair diamond stuff it requires a diamond to repair iron tools its iron ingots and so on....) but it doesn't repair it back to 100% it would only repair 20% each time)

5. Clock Mod (make a clock and be able to place it on wall and it would still tell you how long until Day/Night is close)

6. Craftable XP Bottles (made with a empty bottle on the bottom glowstone dust on top of the bottle and it would make 4 XP Bottles)

Well thats all i got for now if you seen any of these mods anywhere's please comment with the link or comment if you made it and actually published it on a minecraft mod website! thank you!