I would add different demesions. You know, along with more mobs though. To put a picture in your head lets say you take 10 blocks of purple wool and put water in it, you would go into the "Inverted Demension" where everything is colored differently and looks rather scary! In the "Inverted demension" all mobs are hostile, yes people, even pigs. But in the "Inverted demension you need to where a cirtain type of armor called Inverted Matter armor, which is made by doing the original armor recipes replaced with purple wool! Not having Inverted matter armor results in poison and suffocation from the deadly toxins in the "Inverted Demesion". (as a reference to the opposite of oxygen!). NOW enough about this "Inverted demension", on to the "Kitchen Demesion"! Can you guess what its about? Food! Lets get rolling... The "Kitchen Demension" explains itself in a nutshell, except theres something odd about this place though, it may be filled ith glorious food but its also GIANT! A GIANT KITCHEN! Its hard to explain this place so i will leave a picture! Now next is the peace dememsion!. you can make this portal just by making a portal with wool and lighting it with water. This place is filled with angels and faith, where you can make trades to these angels for many different items but the most valuable item is "angel wool"! with this angel wool you can make "angel wings!" i will leave a picture for the crafting recipe for what the angel wings would be! Now to wrap this up the last place is not ment to be traveled to by portal... its... THE VOID! The void is traveled to by creating a "bedrock breaker"! I never decided a crafting recipe for a bedrock breaker nor do i know what it woiuld look like. But the void? its just like the regualar world... but somethings strange around here.... people are bowing down?... your...your...A KING!!! and you can tell other NPC pesants to follow your orders! Well thats all i got, See ya later PMC! I gotta get crackin to make these pictures! ;D