Hi i finally gotten around to a back splash two years after finishing rest of kitchen and settled on walker zanger pipe smoke as the tile, the 2x6 subways with some decorative borders in same color. My cabinets are an off white color called marshmallow cream, but I am having trouble with picking grout color if I want the look of grout lines disappearing, meaning a color closest to the tile color? Any suggestions? I have of off whites that will work if I want grout to make tile pattern stand out, but can't figure the blend grout line color? Any suggestions? Any suggestions in how I decide to use the off white to make tile pop versus the darker grout to have pattern disappear?

Thanks