Learn how to make your own sensory stress balls using polymer beads and balloons. Kids can have so much fun with this activity and experiment with different colors! (Or it can be a stress ball, have you ever thoung of that)
DIY Tiny Sumo Bowling Pins for Kids, made from recycled plastic bottles - ewe on the sumo; but a nice cheap way to make a bowling set for toddlers. For whatever reason bowling sets are always a favorite.