Interesting idea to have the tiled floor/painted wall combo and the tiles in the shower match the wall colour but are different from the floor. The niche for storage works is practical. Would the walk in shower spread water all over the bathroom?
The floor tile in this bathroom by Mark Reilly Architecture is Heath Ceramics' Half Hex Mix. The walls are beveled subway tile (click the link and scroll down for sources). - 10 Bathrooms with Showstopping Tile Plus Where to Find It