Isn't this gorgeous? The back of the niche matches the decorative tile detail, and the shelves themselves match the stone used on the bench, give it an architectural detail, and leave some sneaky space for those of us who buy in bulk.
A shower bench and a shower niche. Make sure the niche is large enough for Costco-size shampoo bottles. A bench in the shower is especially useful as a universal design element (and a place to prop legs on while shaving).