i think it'd be pretty nifty to have a world in Space and we'd have to purchase (from one of the vendors) astronaut gear and what not and there could be alien animals and weird colorful plants and things. and on the ground instead of flowers and patches of grass, we could have stars and craters or something.
also i had an idea for a game (quite similar to rainbow run), and you go to another space type of world and there's no gravity and you have to jump around and collect quoins.
:)