White and blue is a classic color combination in country cottage decorating. If your room features a navy blue couch, painting the walls a crisp white allows the furniture to pop against the clean space, making it the room's focal point. You can also give texture to the walls by adding beadboard paneling to their lower portions. If you prefer that the couch blend into the room rather than stand out, paint the beadboard white and the top of the wall a navy shade that complements the couch's upholstery.
In a room with country cottage décor, wood flooring is usually the most authentic look. Centering your navy blue couch over bare wood floors provides a clean, simple look that works well with white walls. However, if you feel like your floor lacks warmth, a plush area rug positioned in front of the couch can center your seating area. Select a pattern that incorporates both blue and white so as to tie together the dark color of the couch and the bright shade of the walls. A floral design is ideal for a country décor and can add a touch of softness to the room.
A room that features only blue and white can seem plain, so consider using other colors to spice up its look. Red, green and yellow are colors commonly used in country cottage décor. Consider adding patterned pillows that feature these shades to your navy couch to give the room added dimension. Gingham, striped and floral patterns all work well with country décor. However, avoid using too many different patterns so that your room doesn't wind up looking too busy.
For an authentic look, whitewashed wooden furniture is an ideal addition to a country cottage style room. It has a weathered, antique look that gives the space a cottage-like feel. Pair your navy couch with a whitewashed coffee table and matching end tables to balance out its darkness. You can purchase furniture that is already whitewashed or paint items that you currently have. After sanding an item's surface, apply a mixture of one part white paint and one part water to it with a brush. Work with small sections at a time as you will need to wipe away the whitewash with a rag while it is still wet to get the desired semi-transparent finish. You can apply additional coats if you want a more opaque look, or sand the furniture after whitewashing it to emphasize the wood's natural grain.