Need cheap ideas for VBS adult crafts

I have been drafted as adult craft VBS leader and need help with ideas. I have a month to go and a $100-120 budget, with approximately 15 adults per night x 4 nights. If I had all year to plan I could have picked up goodies here and there but now on a time crunch. I'm trying to keep from doing anything "too childish" and have 1 hour a night with them. It can be a project that takes more than 1 hour to do. Any help is appreciated!