One simple and inexpensive idea is spin art using salad spinners. You just need a few salad spinners, paint, and small paper plates (glitter optional). Trick is not to use too much paint - so they don't take too long to dry. Would recommend experimenting with it ahead of time. Sometimes you need to add a little bit of water to tempra paint.
Staring to plan our annual Spring Carnival and I'd love to add an craft table for an activity. We have approx. 600 students and we have quite a large attendance. Any inexpensive craft ideas popular to the masses?