Guests throw darts at balloons with paint inside. You keep the art. :) This is such a fun Idea. You choose the colors and the size to coordinate with your style - might be more enduring than having a fingerprint tree in your house forever.
* Eye Spy Lists For Guests With Disposable Cameras At Weddings* - create a game or list of photos / moments you want your guests to capture on their cameras. This gives purpose to the camera sitting on the table and you’ll get photos you want.