Teaching pitch: DIY Turn PVC pipes into a playground musical instrument. I wish this had the instructions with it, but I might be able to figure it out. This might even work as a service learning project for my daughters' school.
DIY Nature Paint Brushes for Kids - Making your own nature paint brushes is easy, fun and free! It will get you and your kids out in the nature and kids will have a blast collecting natural materials - And pine needles make fantastic brushes!