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The back of a door that opens into a utility room or closet makes a handy hanging space. The trouble is that most doors don't offer a good mounting surface for hardware. The solution is to screw a piece of 3/4-in. plywood to the back of the door. Add construction adhesive for hollow-core doors. Cut the plywood 3 or 4 in. shy of the door edges to avoid conflicts with the doorknob or hinges. Now you can mount as many hooks, magnets and other storage gizmos as you like. Want more behind the door storage? Check out these inside-cabinet door storage ideas.