Color is the first place where your design can go terribly wrong! If you pick a bad color scheme, it will be the first thing your visitors notice, and they won't get over it. Keep in mind, the web is all visual.
Colors play a role in every design created, including black and white (shades). In most cases, your website color scheme should implement your existing colors (such as colors in your letterheads, business cards, etc.). However, you may choose any color, whether it will implement your existing colors, such as lighter shades, or combinations, or colors that may be more appealing to the eye.
Color can be the most important element in image design. Keep these factors in mind when determining what colors to use and how to implement them.