Steel Cube Wall-Mounted Cabinet from the Container Store is $477.89, and the modular compartments can be rearranged into different configurations.
These Freden Wall Shelves from IKEA ($39.99 each) are paired with a Bekvam Step Stool ($14.99) for easy access.
West Elm's Metal/Wood Bath Accessories contain a range of towel bars, wall-mounted shelves, hooks, and rings for $16 - $44.
Vitra's Utensilo has been a hold-everything organizer since 1969. It comes in two sizes and runs between $300 and $400. Other suggestions for wall-mounted bathroom storage?