This is the master bath shower in a house that was rebuilt after the tragic Cedar Fire of 2003, which Wikipedia says was the second-largest wildfire in California’s recorded history.
But from the ashes of the San Diego County fire came this opportunity to rebuild, and thus this shower.
The flooring is slate, and the band under the seat is Indian multicolor slate.
The gray tile on the walls is a Dal-Tile porcelain called Aqua.
And the bench seat and tub counter are red marble.
I found this shower on a blog called Duderosa.