This is a scheme using two sets of complementary colors. Having four colors to work with can be more challenging, but it can also produce a full and rich color scheme. Using a dominant color with three accent colors is one way to harmonize a tetradic color scheme. The other way to create a pleasant tetradic scheme is to use muted tones of the four colors. Any complementary scheme will contain warm and cool colors and requires special care balancing the two. These colors form a rectangle on the color wheel. Neutral colors are an elegant choice for monochromatic color schemes. To find a monochromatic color scheme on the color wheel, look at one color, like red, and look at the other tints, tones, and shades within that same angle of the wheel.