Maybe you should try a earth-toned rug that has elements of dark brown and black into it. Something with a geometric design, maybe. I would want to put something down that had more beige colors in it, lighter than both the hardwood floors and couch to offset the "heavy" appearance of having such dark colors close together.
Something like this would look really contemporary and offer a lot of flair: www.overstock.com
Or maybe something like this, because it has the elements of black from your couch, and also a nice light color to liven up your space: www.overstock.com
Something like this would look really contemporary and offer a lot of flair: www.overstock.com
Or maybe something like this, because it has the elements of black from your couch, and also a nice light color to liven up your space: www.overstock.com