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.
Cheap guestbook, Buy Quality guestbook for wedding directly from China guestbook wedding Suppliers: Wedding Decorations Vintage Wedding Fingerprint Tree Guest book Alternative Wedding Guestbook for Baby Bridal Shower 6 ink pads