The Parent's Resource Center explains that the Koosh ball came to fruition back in 1987 as a tool to help children learn how to catch a ball. Engineered by Scott Stillinger, the Koosh ball earned its name for the sound that it made when caught. Stillinger's prototype was a group of rubber bands tied at the center. Although the colorful invention sells in most toy stores, you can make your own at home for a fraction of the cost.
Purchase a box of rubber bands from an office supply store. The color of the rubber bands does not matter, but they must all be the same size.
Remove the rubber bands from the box. Stack the rubber bands on the table in front of you evenly, one on top of the other. Pick up the stack of rubber bands, pinching the stack at the center using your fingers.
Secure the stack of rubber bands at the center using a thick rubber band. You will probably need to wrap the thick rubber band around the center of the rubber band once or twice depending on the width of the stack.
Cut the loops of each rubber band with a sharp pair of scissors once the center of the stack is secure. Repeat the process for each homemade Koosh ball.