Three colours adjacent on the wheel

Three colours evenly spaced (120° apart)

Base colour plus two adjacent to its complement

Four colours evenly spaced (90° apart)

Single hue with varying lightness

Two complementary pairs forming a rectangle

Analogous colours plus their complements

Five colours evenly spaced (72° apart)

Analogous colours with a complementary accent

Colours spaced by the golden angle (137.5°)

Slightly off-complement for softer contrast