Hmm,
An idea? An easy one to start you off, somethin' new, well.. Les' see here... How about a small 64x64 rpg, with a mild storyline, by mild not extremely detailed, jus enough detail to keep the player involved in it. Or you could make some kinda rpg mass game.. I've no clue, how about a tag game? Perhaps, a.... Mass Game? With actual terrain advantages? OR, you could make some crazy game that makes .00000000001% sense....
Sorry I know I wasn't much help :\