At our wedding, instead of having a guest sign-in book, we had a sign-in piñata! We asked our guests to write out a "joke, note, message, prediction or encouragement" for us to pop open on our first anniversary. Today, we read those messages, and I have to say, it was a perfect way to commemorate our wedding and first year of marriage.
PS: Thank you to all of our guests that filled out notes for us.
PPS: Some of ya'll are crazy! You know who you are ;)