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.
Garbage Pail Kids -Still have all mine! Each sticker card features a Garbage Pail Kid character having some comical abnormality and/or suffering some terrible fate, and a humorous, word play-rich character name, such as Glandular Angela or Half-Nelson.