Nice suggestions

I also have an idea.

Take a retro-game concept like pong, pacman, space invaders, tetris whatsoever... and make something new out of it. You could change lots of stuff while still keeping some concepts/graphics that characterize some famous retro game. You could even combine 2 retro games.

I know this is starting to look like another multiplexity kinda compo, but i like the idea.
(Crashblock is an example of a game that would fit in this compo, i guess )

We could also make fantasy-games. Games that a minimal ammount of things that we know of in this "real world". This compo might result in some funny series of cool, and weird games with a high "never seen before" factor. You could make an unrealistic world where gravity points up, or you could make some kind of puzzle games like chess, or some psychedelic racegame (that also use a minimum of real world items).

Just a few idea's... hope you like'em.