Chandeliers and Outdoor Weddings - could TOTALLY hanf a chandelier from the big tree. Could then install the chandelier in your house. Craigslist has them for cheap all of the time. Could even use just a candle chandelier and it would still look gorgeous.
String different color carnations (or flower of your choice) to hang at outside wedding ceremonies or receptions. This idea would look nice draped either from tables (not guest tables but maybe the card or guest book table) or hanging from indoor reception walls. Highlight them with lights for an extra pop