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.
Games: Spiderweb obstacle, skeleton puzzle race, pin-the-bowtie, witches hat ringtoss, sugar cookie decorating, coloring book musical chairs, and mummy race (two teams, race to see who can cover their mummy the fastest)