This is gorgeous table number centre piece, collect items with your table number and display them under a bell jar. A centre piece and table number all in one. Would also be cool as wedding favors. So each person can take one from the table.
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.