Although I'd still like to come up with a totally out of the box idea, here are some of my stop motion project ideas so far.
-A guy is picking out a shirt to wear for the day and as he looks over which one he wants the shirts wave their arms like they want to be picked. I don't know where I'd go with it but putting support wires in the sleeves of hanging shirts would make this idea a very do-able one.
-Make a marshmallow person with wire limbs and an animated paper face (maybe just an eye or something) and he could react to other marshmallows or the world around him.
-Draw a cartoon, cut it out and have it walk around in real space. This would be a very time consuming one because I'd have to fully animate this cartoon by hand, then cut the figures out and prop them up each frame.