Monochrome
One hue, varied in lightness and saturation. Calm and cohesive.
Analogous
Five neighbouring hues, 30° apart. Harmonious with gentle variety.
Adjacent
Three neighbouring hues, 30° apart. Subtle and unified.
Complementary
Two hues opposite on the wheel. Maximum contrast.
Split-complement
The seed plus the two hues either side of its complement. Contrast without tension.
Triadic
Three hues evenly spaced at 120°. Vibrant and balanced.
Tetradic
Four hues evenly spaced at 90°. Rich, needs a dominant colour.