There are countless possibilities so you'll have to pick something you like.
What Color Accent Wall Goes With Grey. Accent wall colors design guide for the home including color combinations, matching furniture & decor. See accent wall color combinations for the kitchen, bedroom, living room and more.
Flights of Whimsy: Accent Walls: How do we feel about them? from www.sfgirlbybay.com
The accent wall was popular in the earlier 2000s, but it's back and chicer than ever. Shakertown cedar color with bronze dark accents and stone pillar combo. You may just want to accent with a trim paint that will go with your room.
In the interest of taking the guesswork out of giving.
You might base it on a fabric that will be going into the room, like for curtains, upholstery or throw pillows. An accent wall establishes a focal point in your space, so the wall you choose is important. My family room transitions into our kitchen (wall with clock) and we want paint it an accent color that goes well with light grey. Window blinds shades like beige, black, brown, various hues of greys themselves or white would be perfect to go with grey walls.