Paint the trim white to add a visual contrast to the green walls. This lightens the area without your having to paint all the walls. It also provides you with some visual anchors to create focal points. For example, if you paint two wall beams white and position your furniture in between the two beams, the furniture in that area of your living room will stand out more, because the white trim creates a visual room divider.
Create visual continuity between your green walls and brown leather couch by featuring a gallery of photos that you've converted to sepia-toned pictures. Frame these in brown ceramic or wood frames and add light green picture mats.
Hang candle sconces with candles with the room's colors on the wall above your fireplace.
Decorate a dark corner with a floor lamp with a dark green shade and brown lamp post.
Bring additional life to your room's corner by creating an arrangement of potted plants using the brown and green color scheme. If you've chosen an Asian theme, go with bamboo plants. However, if the corner is excessively dark, opt for silk plants instead of live ones. Choose brown or green pots.
Lay down a light-colored rug in front of the couch. It'll draw attention to the brown leather of the couch.
Introduce patterns into the room to provide visual interest. For example, look for throw pillows for the couch that have brown and dark green on them. Mix and match the patterns by choosing accessories that combine both colors in them. Doing this allows you to mix a diversity of patterns such as paisley, stripes, plant prints or geometric designs. Choose accessories for the couch that feature a natural fiber such as cotton or suede to complement the leather of the couch.
Choose a coffee table as well as end tables that are made from wood. Look for a tone that matches the shade of brown on the couch.
Decorate the coffee table by laying down a large mirror and placing brown and green candles on it. Look for candles that match the dark green of the walls and brown on the couch. Select candles of different colors and sizes to provide visual contrast.