Houzz is the new way to design your home.
White tile/grey grout
Tile to wall
Dirty white grout
What not to do-niche
White kitchens need some gentle color to keep them from appearing to be too sterile. The darker grout color used with this tile eases the transitions between the darker woodwork, appliances and light fixtures. This white kitchen looks more welcoming and that's partially as a result of the grout color used on the walls.
Light walls cabinets paired with dark base cabinets are very now and making transitions between the two can be tricky. By going grey, the grout makes the transition a painless one and it relates directly to the light grey paint color on the wall.