It's a colour associated with overcast skies, dirty rivers and drab concrete, but who would've known grey could make such an amazing design impact on the home? When used correctly grey can give almost as much impact as a bright primary colour. Pick a black-grey if you're being daring and clash it with some electric red or embrace the rainy day look with some sumptuous blue velvet. Light grey is also an excellent way to lighten up a room, and it's not as industrial as you may think. White walls with one pale grey feature wall can command attention without making a room look smaller, and when brought out with light but bright pastel accessories like a pink frame or a lilac vase the grey can really pop.
Of course there is nothing to say you can't go all grey everywhere, it can actually have a dramatic and beautiful effect, but it works best with plenty of natural light; try to avoid too much artificial lighting. The best way to match your furniture with an all grey interior is to use colour blocks of white and grey with bold graphic statements such as lines, and simple shapes.