When you have grey walls, overhead lighting can cast harsh shadows. To avoid this, add lots of table and floor lighting to create a well-lit and warm room. Put a floor lamp next to each end of a couch, or install wall sconces as an alternative to using ceiling lights. Grey can sometimes cause a room to look and feel cold, and using lots of wood can help offset this. Show off a wood floor, set up wooden tables or chairs, or hang pictures made of natural wooden frames.  If your walls are a lighter grey, you can work with darker wood. For darker grey walls, opt for wooden furniture that’s a bit lighter. Make sure the furniture isn’t painted—you want to show off the natural wood color. You can create contrast by choosing wood that is textured or embellished. Patterns are a great way to make a monochromatic or neutral-colored room look more interesting. Choose rugs, pillows, chairs, and other decorations in different styles of patterns and fabrics.  Select a couch with grey and white stripes on it, or put pillows with floral patterns on solid-colored chairs. Pick out a patterned comforter to go with grey walls. Your rug is a great way to either add color to a grey room or keep the room in neutral tones. A striped rug made of bold colors will add color to a light grey room, while a white or cream rug will help lighten a darker grey room, A rug of the same grey that’s on the walls will create a neutral backdrop for you to emphasize your furniture and accessories. Choose furniture such as a leather couch or woven twine coffee table to give the grey room a natural feel. You can also find accessories and decorations made of wool, wood, linen, or knits.  Pick out pillows made of a knit fabric, or use a wool blanket to drape over a sofa. Hang curtains made of linen for a light, natural look. Use macrame or tapestries to soften the hardness of the grey and add visual interest.

Summary:
Add table lamps, sconces, and floor lamps to create the right lighting. Select wood furniture to bring out warm undertones. Play with patterns to add texture to the room. Choose a statement rug to set the mood for the room. Create an outdoorsy atmosphere using natural materials.