I don't know why, but my favorite fantasy location has always been the mushroom forest. Be it the underdark cavern filled with mushrooms of various sizes or the fey/alien feeling mushroom forests of the surface world, with towering 'shrooms that blot out the sun. I can't get enough of em. Back when I was a bit more dedicated to playing World of Warcraft, my favorite zone in the game was Zangarmarsh.
My fiance thinks I'm crazy, but I really want to move here instead of a land with kangaroos
Given that my family campaign has been put on hold since living arrangements, jobs, and other things are all in a jumble and require my showing a level of patience that would test stone, I think I'm going to start designing a small mushroom forest valley for a sandbox.