S'mores bar - roast your own s'mores. What an awesome wedding reception idea! Would be so much fun for kids- although wouldn't it be more fun (if you have a small wedding) to have a Campfire outside and roast s'mores
Balloon Wall as a photo backdrop. Tape the strings at various heights to create a wall of balloons. Instant backdrop in any color. Guests could have their picture taken in front of the balloon wall by Mary maybe, sort of like a photo booth.