1 Backyard Ball Run 1. Backyard Ball Run (via Learning Through the Clutter) 2 PVC Periscope 2. PVC Periscope: My son came to me with an idea to build a periscope. He had found a simple project in a book which used a milk carton and two mirrors. We had a couple… (via Instructables) 3… Continue reading 50 Fabulous Kids Toys You Can Make Yourself