Split up into groups and give each child a roll of toilet paper or white crepe paper. Each group has to wrap a parent, or maybe the teachers, like a mummy. The only thing allowed to show, when it's all over with, is the person's face and feet. First team done wins. Not the most eco-friendly game, but it's inexpensive and I think the kids would think it's hilarious.
These 10 Minute to Win It games were perfect for all ages (we had guests from ages 4-55 playing these games, and everyone had a blast!) – challenging enough for older children, but easy enough for everyone to join in the fun!
Take a look at the coolest construction birthday cake with a step-by-step pictorial on how to make. Bakerette.com. This might be close to what we'd do except the excavator would be on the side and we could do his name on it and a number 5 on it.