We are having a photo booth at our reception and we plan on having all of our guests take a photo that will be placed into our wedding book. They will also get to either write us a note or just leave us their name. This way we have a picture and the names of all our guests.
Love all the really cool ideas that the ladies shared, I might copy something like the leaves idea. I'll also have guests go to my wedding website and write their well-wishes, and other comments on that page. 😃