A custom walk-in shower large enough to need two shower heads, tiled in wood-look porcelain with a slate and glass mosaic running through it at eye level.
The pebble floor is the part people notice and the part that takes the most care. Pebble needs a pan sloped accurately to the drain before a single stone is set - get the fall wrong and water stands in the low spot for the life of the shower. The niche and the bench are both framed and waterproofed as part of the same system rather than added afterwards, which is the difference between a feature and a future leak.