Every guest puts their fingerprint on the tree and signed their name. At the end of the ceremony, the bride and groom added their fingerprints on the swing hanging from the tree! Or do a family tree with grandpa and grandma on the swing
An interesting unity idea! Instead of mixing colored sands in a jar or a unity candle, this couple mixed paint on a canvas during their ceremony. But maybe add a monogram in tape, and tear the tape off after the paint dries?