Paint your walls with a dark color to offset the light brown color of your sofas. You can also use brighter, more vibrant colors as long as they are not too light.
Select furniture that resembles the style of your light brown leather couches. The fabric does not have to match, but the style of the furniture should match the style of your couches.
Place a wooden coffee table in front of the sofa if you are going for a rustic look. Use a glass topped table if you're going for a more formal look.
Choose a light-colored rug to offset the dark color scheme on the walls. The rug can be beige or a similar color.
Use drapes that match the light-colored carpet. The drapes should also create an interesting contrast with the walls.