Keep in mind, too, that colors can mean different things in different cultures. If you do business primarily with other countries, research what colors mean in those countries. They may not mean the same thing that they mean here in the States. For example, in China, red is the color associated with weddings, whereas white is used for funerals. You could be sending the wrong message without even realizing it!
(For purposes of this article, the color meanings listed below are U.S. meanings. I don’t feel qualified to comment on other culture’s color meanings.)