Select a color scheme. For a muted look, choose hues that have the same value as your sofa. Deep blues, dark browns or yellow-toned ivory shades help create a quiet look. For a bold color palette consider a bright purple, energizing red or vibrant green to stand in stark contrast to the gray color of your sofa. Limit you palette to three or four colors to eliminate confusion in your design.
Find a style that fits within the design of your house and matches the style of your sofa. Armless, sharp-edged sofas fit well in a modern or contemporary style, while oversize or tufted pieces work well for a traditional or shabby-chic look. Pick a style that makes your sofa fit in with the color scheme and design of the room.
Select matching furniture that goes with the design of your sofa. The furniture's upholstery needs to fit within your color scheme, but it does not have to be the same color as the sofa. If the sofa has stocky, angular legs, for instance, look for furniture mimicking the same. Keep the furniture pieces similar to each other in style and mood, using the color scheme and accessories to bring out personality in the room.
Add accessories to define the room. Numerous accessories, in the form of wall art, table decor and lighting fixtures, are available to add interest in a room; winnow your choices to a few pieces that make a statement. Instead of using traditional table lamps, consider tucking several floor lamps with unusual bases in the corner of the room. Put an oddly shaped artifact in the center of a coffee table or arrange eye-catching pieces of art in an asymmetrical pattern.
Decorate with bright pops of color using throw pillows, blankets or a bright rug. Bring out the gray hue of the sofa by painting a single wall in a similar color. Use the accessories to create energy with color. Make your room a showstopper with a bold patterned rug, trendy accents and textured surfaces.