Thanks so much! We built this bathroom using marble tile trimmed out with slate tile and slab. The combination of the two worked really well and the client was very happy. We actually bought a slab of slate to do the thick trim as you enter the shower and on the bench. And then we used stacked slate (which comes in sheets) to climb the walls around the windows. The floor and ceiling of the shower is also slate in a brick pattern (approx 1.5"x3" pieces but they come in sheets too). Best of luck, you can see more of my work at www.sfhearth.com or contact me at peter.sheridan@sfhearth.com