Rub-a-Dub Tub . . . A built-in tub surround typically provides enough space to house tilt-out storage for extra cleaning sponges, shampoo, and soap. Stash your favorite bubbles here, so the kids (and guests) don’t get to them.
And again under cabinet drawers. But we just hate unused precious space in our home. Btw. Check IKEA, the have these drawers as sets. How to Build Under-Cabinet Drawers Increase Kitchen Storage!!