Tenmar said:
http://img189.imageshack.us/img189/3631/contestfoundgames.jpg
The skeleton asronaut is obviously Dead Space, the asteroid is Asteroids, the diving helmet is Bioshock, the monkey (which may be holding a passport) is Ape Escape, and the trumpeter on the roof is Far Cry.
Hope that helps.
EDIT: And the cogs are Gears of War.
EDIT AGAIN: The Crowbar is Half Life, the hill is Silent Hill (Keep Quiet), the Banana is Donkey Kong or Mario Kart, the stick-rabbit (far left, middle) is Vib Ribbon.
EDIT AGAIN AGAIN: The grave with 'RIP 4' written on it is Left 4 Dead.
EDIT AGAIN AGAIN AGAIN: The little green thing is Loco Roco.