Rules of Color Blocking:
1. Three is the magic number
Stick to two or three colors. Two’s fine but three creates a more interesting and effective contrast.
2. Don’t be afraid to clash
The normal rules don’t apply here, don’t be afraid to combine colors you usually wouldn’t, yellows and greens work well!
3. Keep it in the family
It’s also works when you mix two tonal variations with a more contrasting color, for example pinks and purples against a vibrant lime green.
4. Be loud and proud
This trend is all about bold bright colors. The more vivid the shade the better.
5. Keep it simple
The look works best with plain neutral accessories; break up the color blocks with cream, black or grey (shoes, belt, clutch, etc.) . NEVER attempt to mix prints or patterns.
(polyvore- technoNfashion 122)