the glory of beeing super creative...

I love to read books and watch movies that are.. well, somewhat in the fantasy family..
what I really like about them is the way that sometimes you find this entirely different reality.
I've "visited" worlds in water, under ground, in space, in the clouds.. even a world that is shaped as a huge disc carried on the back of 4huge circeling elephants that again are on top of a huge turtle just swimming through space...

if you were to create a world.. what would it be like? who would live there? what would they eat? how would they communicate? would they have religion?