"This would be funny to explain who everyone in the wedding party is, the program, etc. (funny facts about bride/groom & everyone else)" this is pretty great.I like the funny facts about each person idea
Wedding Ideas: Unique Alternative Wedding Guestbooks
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.