Butterfly swap: Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new. (II Corinthians NKJV) DIY Folded Paper Butterfly with tissue paper and pipe cleaners.
I love this idea. An envelope guest book. You just take a store-bought scrapbook/album and glue envelopes into it. Lay out colored pieces of paper for guests to jot notes down on, and then they can place them in the envelopes.