I was told by a art student that if you mix all of the colors together, you will get brown (or some shade of it). So ANY color goes with brown. They are complementary colors. I think that picking the color to go with the brown should depend on the time of year. Oranges, ambers, reds should be in the fall. Pastel pinks, greens, blues, yellows for spring. Bright pinks, blues, yellows for summer. Dark purples, reds (even icy blue) for winter.