Make teams, 4 is ideal. Each team should designate someone to be Santa. Give each team a set of materials. Instruct them to use those materials to make a costume for their Santa. (They don't get a pair of scissors -- this makes it more challenging.) Give them a time limit, 5-7 minutes, but use your judgment. If they still don't look like they're going to be done in 7 minutes, give them a few more. You'd be surprised how elaborate people can get! Have everyone judge the Santas for different categories so that everyone's a winner. Award prizes.