Really looks great in a shower niche in a shower tiled with bond indio matte porcelain. Also used rondec edge trim to give it a clean interface to the wall.  Although I used a 'steel blue' grout and silicone for the rest of the shower to create a nice clean uniform color, this tile as a backsplash seems to benefit from a somewhat lighter grout (noting that it already has a subtle black boundary at the edges to make the colors it has stand out). Whites and light grays were too light so we mixed some remaining steel blue grout with a lighter grey and it gave us a nice bluish grayish medium lightness that made the niche really show off it's colors discreetly complimentary to the rest of the shower.