We added this niche to the tub/shower combo. The shelves are calcutta marble and the backdrop is mother of pearl.
Mother Of Pearl Penny Round Tile Backsplash | Dream Kitchen
white iridescent mosaics glass silver kitchen backsplash tile bathroom wall mirror deco tiles fireplace tile More
Free Shipping Italian Marble Herringbone for $11.75 a Square foot. This has been really used well for a backsplash. These little 1x2" pieces look as good on the bathroom floor as they do in the kitchen.
Art3d 6-Pack Peel and Stick Mother of Pearl Shell Tile fo... https://www.amazon.com/dp/B01G8H7ARY/ref=cm_sw_r_pi_dp_V1ODxbZJCSKYB