I actually have an idea I've been toying with for a while. It'll be a board-game-converted-to-forum-thread-game game, but since it's a game that I'm 99.9% sure isn't playable online anywhere, it will actually work as a forum game.
I'll be doing PhotoShop out the ass for it, though. >_>
Sadly it is only a 4-person game, which means people are going to have to wait in line, but depending on how much effort goes into the 'Shop jobs, I may very well be up to running more games (though never more than one at once).