Light grey walls work great in a mostly white kitchen with a few black accents such as Rotpunkt Zerox design. For big spaces with open plan kitchens, dark grey walls put the sophistication of black and white kitchens on full display.
If your kitchen is on the small end of cooking spaces, white walls will help you bring in more brightness and open up the room.
Light green walls can really bring a black and white kitchen to life. A pop of colour will lift up the light and dark combination