simple 3d game idea?

So for my graphics class, I need to make a simple 3d game or application. It needs to use lightening, 3D objects and some sort of user interaction (keyboard/mouse). I am having a hard time of coming up with simple game ideas. Any of you guys got an ideas that could be put to use? If I take your idea I'll be sure to post the executable so you can play your game.

So far my list includes:

3d flight simulator (somewhat advanced actually. Camera/simulation of moving is the hardest part)

3d jenga
firework simulator (gunpowder, angle, color, explosion type)
first person maze game (3d world where you navigate through the maze)
monkey ball type game
poker
chess

Any ideas are welcome!

3d Marijuana Growing

I like the maze idea. shouldn't be too hard to program either.