Delorean Gray Vs Natural Gray . (313 mm) joints for interior or exterior. The color has a balanced color profile. Image result for poly blend grout natural gray Polyblend grout colors from www.pinterest.com Summit gray (sw7669) by sherwin williams is a strong dark gray paint color with a lrv of 30. #9 natural gray #10 antique white #11 snow white #19 pewter #52 tobacco brown #59 saddle brown #60 charcoal #95 sable brown #105 earth #115 platinum #122 linen. It comes down to preference and how much you want your tiles to blend or stand out.