I stole this picture from one of my friend's wall posts on Facebook.
Hooray for crayons at a wedding! (It turns out my friend had to steal them off the kids' table, but I love this idea.)
How fun would it be to cover the tables in butcher paper (or recycled craft paper), set up cups of crayons and let everyone express themselves all over the tables? Plus, later you could cut out memorable pieces and frame them as keepsakes.
I'm going to add this idea to my List of Ways to Have Fun at a Wedding.