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.
GRADUATION-Love this guest book idea for a grad party! Before leaving, each guest was asked to “Sign in" -- in a book of photos put together by his parents from his school days. Each guest signed throughout the book just like signing a yearbook.