Interlocking modular wire storage units and plastic bins go together quickly and easily. Your child can help redesign his closet or play area and then assemble some of the storage elements himself by hooking or stacking them in place. This is also a great way to finally get him to inventory, organize and stow his stuff. As projects go, this one can get pricey, but it has some hidden advantages. Your child will be more likely to take responsibility for keeping his room tidy if he helped design and "build" his own closet or play area, and once you do have enough storage, you (or your child) can finally get things, like toys and school gear, up off the floor.