What I like about making my own materials is that I get to use exactly what I want and have it immediately. I wanted a vibrating ball that did not make weird noises and was large enough so that a 2 year old would have to grasp with both hands. I made this by filling a plastic bag with other plastic bags. There is a vibrating pen (point removed) jammed inside and the rubber bands hold it in place so that I can easily find it and move the lever to turn it on and off.
One little girl enjoyed holding this while facing sideways as we walked in circles. The curvy movement while facing outward quickly impacted her posture and she sat more erect. She typically neglects one hand, but grasping this ball gave some nice sensory input while balancing during movement.
Barbara Smith, M.S., OTR/L author of, The Recycling Occupational Therapist