Use of color is discussed in a helpful way by this page from Webpage Design for Designers:
For most people, colour is something taken for granted. It is all around us. Yet, when we come to use colour, in paintings, in design, in our furnishings and clothes we often make mistakes because we don’t understand what is going on. Some people will say that this colour goes with that colour and that “blue and green should never be seen.” They will even try to make up complex tables and formulae for combining colours in pleasing ways. I’m not going to do that!