Using an area rug is a great way to unite different colors and themes. Rugs can also add texture and coziness to a room. Determine if you want to add color to your room and make your rug a strong focal point, or have it blend with the rest of your environment in a subtle way. To add punch, try a traditional rug in jewel tones, such as Tufenkian's Floral Heriz Carpet , or continue with your neutral palette using a rug such as Asmara's Odessa Carpet to maintain a softer feel. Since your furniture styles are classic, keep your rug classic.
Rugs are also great for pulling out wall and trim colors.
Painting your walls a color, even if it's a neutral, will add interest to your room and help your wood pieces stand out. Determining what sofa is right for you is a matter of personal taste and comfort. I would recommend going with an understated, classic style in a neutral covering, or a stronger color in a solid tone or texture, depending on what your rug looks like. Keeping your sofa simpler and more classic is a great way to avoid competing with your other pieces. If your sofa remains neutral, but you still want to add some color, find some fabulous accent pillows or a throw to add punch.