Summarize:

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.
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.