Hmmm, okay, I have an image in my head... Perhaps I can make something like it someday too, but yeah. ^^'
Perhaps you can make a sort of cave-like map, with a secluded little village of some sort. There can be dark twists to it and stuff like that, too, and some sort of plants intended for the cave. (Or just plants that survive without sunlight, strangely but interestingly.)
Or maybe not a cave, but more of a "dark world" of some sort. :{o