Picking colors schemes (or colour schemes, in the Queen's English) can be difficult, and it's easy to fall into the bad habit of using the colors that have worked in the past.
The trick is to find a source for an online color scheme generator, which will let you browse through sets of complimentary colors to pick a color theme for your site.
Here are some great colour resources to help;
Keywords: color scheme, colour scheme, colour theme, color theme, colour set, colour set.