Make a piece of plywood into a beautiful photo op for the wedding couple and guests to use throughout the evening. Plywood, wallpaper or paint and some thrift store frames painted with metallic paint. For photo booth
"Stones and Rocks DIY Wedding guest book". Guests write messages to bride and groom on rocks with Sharpie instead of signing traditional guest book. This would be cool to put in giant glass vases on either side of the fireplace once the wedding was over.