Color selection for your website is a very important mater during the design process. The color says so much about the style and message of your brand/business. Most companies have a style guide that specifies the color for web and print. These companies even go so far as to have a certain color trademarked for them.
How people see color and the meaning of that color is very important to the perception of the sites message. There are studies and articles about the effect of color on the human brain and the meaning that particular color conveys. So, it is very important what combination of color you select for your branding and website.