Shampoo niches for the shower
Stone wall behind 2 backlit vanity mirrors. Wood and bowl sink counters. Drawers and shelf option allow for open feeling. Simple window frame can be treated to see out without seeing in.
As Tadelakt is water repellent there's absolutely no demand for tiling etc. Tadelakt is incredibly versatile and may be used in a lot of means. Tadelakt not on.