Internet Marketing -- Web Safe Colors
Some colors look terrible and some look fine on just about everyone's computer. I don't advocate a lot of graphics or color anyway, so my advice is to simply get a professional web designer to make any custom graphics for you and you won't have to worry about this issue too much. If you really want to learn more about color, please visit these sites:
http://kresch.com/resources/browser_safe.htm
http://www.webdevelopersjournal.com/articles/websafe1/websafe_colors.html
Use this massive link to learn about making your site accessible to color blind people.
TOM’S TIP:
Try to read this:
Tom is a loudmouth jerk.
Now read this one:
Tom is a loudmouth jerk.
Make sure that you can easily read the text on your web site both on the page, and in graphics. Don't let your passion for color override your common sense. People have to read your site before they buy.