There were a few demo-type games that came with my first webcam in 1998 (It was $90, AFTER rebate, and an open box item :Q)
There was a clown-punching one, and a ball bouncing one... I can't recall the others.
On the PS2 front, the fireworks game that worked with the webcam was actually pretty fun. I think typical distance from the PC could be an issue, though.