I'm considering an open setup game that would, I think, be considered theme (can't see it being normal, and it's not quite experimental):
Smalltown mafia - everyone knows everyone else - roles are revealed (as in, there for everyone to see, on the player list), but are unrelated to alignment. I figure the town wants a bit more power behind it (and I like giving everyone an active role), but classic roles seem too breaking, so I figure weaker, more obscure roles are the way to go.
Something like:
1 Gunsmith
1 Forensic Cop
1 Bodyguard
1 Faith healer
1 Vigilante
1 Bomb
1 Beloved Princess (if mafia member, skips a Night instead of a Day)
1 Tracker
1 Commuter
1 Cowardly Reporter
1 Doublevoter
1 Executioner
With 3 of the above being mafia (1 kill per night, 1 mafioso has to be sent to perform it, and must skip their other ability), and 1 SK (1 kill per night plus his standard ability - if tracked, shows both targets).