X - Sherri Cassara Designs: Newland Barn Wedding. This might be a good idea. Get some cheap blankets in the early spring. I don't think it'll get that cold at night but I want people to be comfortable.
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.