Personally, I have always thought about the empty space under the bathtubs.

The Stowaway bath panel storage system from GW International utilizes the unused space underneath the bath and turns it into a useful storage place. The Stowaway bath panel is a pull-down panel with chrome baskets that allows for organized storage of toiletries and other accessories. When closed, the Stowaway bath panel looks like any other ordinary panel, but when pulled with the handle on the top edge of panel, it reveals the storage racks fitted underneath.