AUXPhome Exercise Ball Storage Rack, Wall Mounted Stainless Steel Yoga Ball Holder, for Exercise Ball/Yoga Ball/Stability Balls 32 cm to 86 cm (13" to 34"), for Fitness Class or Home Gym,with Screws :
Swiss Ball Stand - Hire Fitness
I can build something like this... Amazon.com: Wall-mount Storage Rack for Inflated Exercise Balls, Holds 1: Sports & O… | Ball exercises, Stability ball, Exercise
DIY Workout Ball Holder For Your Home Gym Organization - Dream Design DIY