Video Warp mode lets you distort live video using your mouse or trackpad.
Color Detection lets you select a color from the live camera feed from which to emit effects, and with Effect Paint you can play with fluids using your trackpad or mouse.
If you want more personalization, there are more options you can play with in Motion FX. You can also use the Face Tracking technology of OS X Lion to emit effects from any faces visible to your camera. A preset cycling mode lets you automatically cycle through effects without lifting a finger. Simply select your favorite preset effect, and create an incredible visual experience by moving in front of your computer’s camera. Autodesk® Motion FX lets you create stunning real-time video effects using your computer’s camera.