Facebook is now the most popular social networking site available as of today, but one thing sadly missing in Facebook is support for themes. You cannot customize the colors in Facebook. In case you are fed up seeing the same old blue color, Colorbook extension for Google Chrome might be useful for you. This extension once installed allows you to customize the color of Facebook including the links in any page inside Facebook.
Once installed, the extension adds a Facebook icon on the address bar and when you click on it, you can see a color palette from where you can select your favorite color. Here is a small video of extension in action.