Facebook is great place to hang out .Its default layout colour is blue.Facebook doesnot provide any official themes but Now it is possible to change your own facebook account theme as you like. You can make your facebook profile more colorful . You also able to set you own background Image on you facebook account.there are many ways to change your facebook themes.
Using stylish firefox Add-ons
Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.