Stain/paint crates, add a pair of shelve racks, and you have an attractive storage unit for towels or anything else that requires easy access. Reinforce the crates by securing with screws through the wood into the wall.
Undersink Organization - Chaos under your sink? Tame a crowd of spray bottles by installing a curtain rod across the cabinet. Suspend them by their spray triggers, and voila! Freed-up space for other bathroom or kitchen essentials.