A Monochromatic Color Scheme is created by taking any oneof the twelve Hues from the Basic Color Wheel and repeating it in various Tints, Shades and Tones.. (http://color-wheel-artist.com/monochromatic-color.html)
same color but different intensity. from dark to light.
Analogous complementary
Choose any color as your main Mother Color. Then select its Complementary color directly across from it. From there choose two or three colors on either side. A total of three instead of four Analogous Hues work best to avoid over-complicating things.（http://color-wheel-artist.com）
use colors that are next to each other on the color wheel
Triad
A triadic color scheme uses colors that are evenly spaced around the color wheel.(http://www.tigercolor.com/color-lab/color-theory/color-harmonies.htm)
Pure Triad Colors combine every fourth color on the Basic Color Wheel.
Tetrad
The rectangle or tetradic color scheme uses four colors arranged into two complementary pairs.(http://www.tigercolor.com/color-lab/color-theory/color-harmonies.htm)
combine every fourth color on the Basic Color Wheel.
