At my cousin's wedding last July they had a photo booth, which was such a fun extra! I had fun dragging Eric and all of my family members into the booth and taking photo after photo! It's not cheap so unfortunately we wont have such a thing, but we have decided to do something similar. We're going to have an instant camera set up next to our guest book in the hopes that people will take a picture, place it in the book, and then sign. We may even make some props like mustaches and silly noses, but this is still up in the air.