Reuse kitty litter containers to organize kid's toys in the garage. The kids can pull out each container as needed and put it back when done. Plus they can easily be washed out at any time! (this picture shows a quick clean-up and organization...I am hoping to get some really neat and playful labels made for each container soon)
Instead of crates... use TIDY CAT buckets for more sturdy, taller stools. Fill about 4 inches of concrete and then screw tops on. Hide screws with colored duck tape and create an easy to wash "skirt" to cover label. Left handles on to lift when cleaning floor.