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.

Purple; it's synonymous with luxury and royalty, so if you're looking to give your room a really sumptuous feel look no further. However, if you're not the kind of person who likes dark or bright colours, lighter hues of purple in lilac and violet can still make a room look beautiful. 
The key with using bright or dark hues of purple is to make a statement; don't shy away from painting every wall in your room - forget the "feature" wall. A shade of purple with an injection of red or pink tones within it can actually open up a small room when you may think it would box you in instead.
Many people like the idea of purple but worry at the prospect of matching accessories to their new wall colour. It isn't as difficult as you might think. Purple walls can actually even look great against lime green furniture, the only trick you have to learn is finding the right shade of the colours you are matching. For example, though I have recommended lime green, a grassy-shade of green may actually clash against a red-purple wall, however, the same green might look great against a lilac wall.
A good idea is to get colour swatches and try them against your shade of purple to see if it works with your own taste.

Of course there are other ways of incorporating purple into your room, try getting a piece of furniture upholstered in rich purple velvet, or a kitsch and bold chandelier in violet acrylic.