Steam punk?
Future?
Evil Spires?
Tree house?
Underwater?
Found these few on the internet, there's no point in really asking what the community likes because every single one of us is different. Go with what you feel comfortable with. It's your map and imagination, not ours. People will play whatever has a good story line - look at those Gold Knight winning DM's they're boxes and are popular because people like the idea, not the look.
Next time please post in one topic, don't create multiple ones asking almost the same thing in each of them.
Cheers,
Crab.