5 must haves for your perfect photo booth. cute idea of something for guests to do, kills some time and gives them a souvenir, too. i've heard of people simply setting a macbook in the booth and using "photobooth" on that.
Perhaps purchase a polaroid camera and try this idea (instead of a photobooth or as a wedding favor). DIY Wedding Table Decoration Ideas - Novel Guest Book - Click Pic for 46 Easy DIY Wedding Decorations
DIY: Ask your photographer to do this! It's a long exposure shot with sparklers. All they had to do was stand there very still and someone else ran around them with a sparkler. It's like a fairy tale! Long exposure shot with sparklers