The shower walls look to be porcelain tiles(just guessing). We can do any color in the rainbow in CONCRETE, either as pre-cast panels or seamless, trowel applied finishes. Lots of folks are not aware of all the possiblities with current cement technologies. Skilled artisans are becoming more prolific, but are still hard to find in certain locales. We love doing showers, our pigment supplier can custom match any color in the Benjamin Moore swatch, and we have found this to be a very useful and effect tool for creating stunning designs that just aren't possible with other materials.