colour

As a principal, no matter what colour is being used, the black and white areas and the coloured areas should never be in perfect balance. One of them should be substantially greater.
  Colours fall into two broad classes, cold and warm. The cold colors are at the green-blue end of the spectrum and the warm at the red-yellow end. Cold colours tend to recede from the spector while warm colours move towards the viewer.
 For the warm colours a small, discreet area is sufficient, but for the sharpest visual impact the colour must dominate; in the case of cold colours, the coloured areas are more efficient if they are larger than the black and white spaces.