Three colors adjacent on the wheel

Three colors evenly spaced (120° apart)

Base color plus two adjacent to its complement

Four colors evenly spaced (90° apart)

Single hue with varying lightness

Two complementary pairs forming a rectangle

Analogous colors plus their complements

Five colors evenly spaced (72° apart)

Analogous colors with a complementary accent

Colors spaced by the golden angle (137.5°)

Slightly off-complement for softer contrast