eModernDecor Over Mount Installation 16 in. x 28 in. ABS Single Shelf Bathroom Recessed Shower Niche for Shampoo, Toiletry Storage SHC-R-1628 - The Home Depot
Preformed Square Recessed Shower Niche size:10x10 Ready to - Etsy UK
Uni-Green Tile Niche for Shower 25" x 17" Dimensions- Toiletry and Bathroom Niche Storage- Simple Installation with Texture Surface Shower Cubby Double Shelves : Amazon.co.uk: DIY & Tools
Designing A Shower Niche That's Functional + Pretty
Ideal Shower Niche Size for Your Bathroom | The Niche Man