An Envelope Guest Book via Martha Stewart Weddings:
How Martha does it:
Transform a store-bought album into a guest book that has a handmade feel. Use double-sided tape to affix envelopes in assorted sizes and colors to the pages of a plain-paper photo album or scrapbook. Leave cards and a pen on a table for guests to write wishes. When they're done, they can tuck their cards inside the envelopes for the bride and groom to enjoy later.
And on the other sides of the pages you can affix photos of you two... very cute.