Sometimes, a touch of color is all you need. Choose an accent color (two at the most) that either complements or contrasts with your current color scheme. Then, let that color flash at different points around the room. If, for example, you choose red, toss a couple of red throw pillows on your bed or the sofa. Put red shades on your lamps. Tie back your curtains with cords in your accent color. And use small accessories, like candles, picture frames, vases and book spines, to bring your accent color to tables and shelves.
A color wheel can help you chose accent colors. Complementary colors are close together on the color wheel, like different shades of blue. Contrasting colors are opposite each other.