Add contrasting colors to a yellow couch with red, black or green pillows. The splashes of color come alive with the yellow background. Toss a dark blue throw cover over one end of the couch to tone down a bright yellow color.
Set a dark cherry wood coffee table and end table around the yellow couch. The dark wood and yellow couch enhance the space with their complementary color combination.
Set a vase of red roses near the yellow couch. Other brightly colored arrangements such as orange or green add a refreshing contrast to the furniture.
Hang a large abstract painting with contrasting colors on the wall behind the yellow couch. Alternatively, hang a grouping of framed black and white pictures on the wall. The black brings out the yellow color of the couch while highlighting the photos with the sofa's shading.
Lay a dark brown or black rug in front of the yellow couch. The dark color mutes a bright shade of yellow.