Like the idea - use a board to save the walls and maybe not Velcro since it'll get gross and isn't easily cleaned. Magnets or even small hole in cup to hang on a hook? Cars, Trucks and Teething Rings: Kids Toothbrush/Bathroom Fix
Backyard Summer Fun: Water Balloon Baseball Looking for a fun and frugal summer activity to stave off the boredom? Try water balloon baseball right in your own backyard--it's cheap and easy and the kids will love it!