I had a good idea i guess...
Do you know the Xbox 360 Indie Game "RC-AirSim" ???
well that would be a great and fun game to create because its simple to control.
It would be played in Landscape view.
Up: Tilt Up
Down: Tilt Down
Left: Tilt Left
Right:Tilt Right
Accelerate: Touch the screen
Well just an idea idk if you can figure out how to do 3D games yet but i hope anyway.