DIY Paintbrush Ideas for Kids using Household Items- I would use this in my science center. First I would have children predict what each of these "paintbrushes" would do, then students would use each of them and see if their predictions were right.
Marble Races with a cheap pool noodle (occupies the kids for hours.) Did this, but instead of cutting the pool noodle, the marble is small enough to fit inside the full noodle to roll down. Then can use the noodle for other things too!