Paint your walls a warm shade of khaki or a similar earth tone. A shade that is slightly darker than your sofa will provide contrast and a neutral background for the accent colors you incorporate into your room.
Scatter area rugs around the room. Bring more focus to your sofa by placing a larger rug in front of it. The pattern should reflect the theme of your room. Bold geometric patterns will complement modern decor, and plain natural fibers will enhance a cottage or seashore theme. A Persian-style rug will highlight a traditional room.
Place accent tables in a pleasing arrangement beside your sofa and between your chairs. Paint your tables black for a contemporary look, and replace the hardware with polished nickel drawer pulls. Tables finished with a white crackled paint provide a weathered look. Embellishing the tables with porcelain hardware transforms the accents into a cottage or seashore style. A natural warm cherry finish with brass hardware works well for a traditional room.
Place decorative accessories on your tables. Small sculptures, illustrated art books, bowls filled with glass marbles or polished pebbles will make your space personal and interesting to your visitors. Sleek glass or metal collectibles reflect a modern look. If you have a cottage-style decor, display vintage porcelains or leather-bound books. Sea shells and decoys enhance a cottage or seashore theme.
Add several accent pillows to your sage furniture. Pillows made from patterned or textured fabric with embellished trims will add some "pop" to the neutral sage green upholstery. Mix coordinated patterns and colors.
Decorate your walls with colorful art. Groupings of paintings or prints will enliven your neutral walls. Continue the room's theme in the art you display. Impressionist-style florals or landscapes will enhance cottage decor, and old abstracts or stark black-and-white photographs will add a cohesive element for a contemporary room. Hang watercolor paintings of marine scenes in a seashore setting.
Add a potted plant to a bare corner in your room. A decorative pot will bring unexpected color and design to a dull area.