Have guests write message to the birthday boy/girl. Could do a new book each year as a keepsake. I have the Places you go for my daughters school years but the birthday idea is super cute too! I didn't know Dr. Seuss had a birthday book!
Great idea to create a background for those hundreds of pictures you take as the baby digs in to his or her first birthday cake. Could be done in any color to match any party theme. or for any birthday for a photo background!