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.
Love the idea of creating a shadow box to remember the wedding! (Ideas)Wedding Program Shower Invitations Bachelorette Party Invitation Rehearsal Dinner Invitation Koozie favor from my bachelorette Party Plane tickets from our honeymoon