Fancy an extreme makeover? With Linux you can change the graphical interface.There is no doubt that you get a lot of choice with Linux. This follows through to the desktop environment. While in OS X and Windows you are stuck with whatever Apple or Microsoft gives you, with Linux you can choose your desktop environment.
The two main options are KDE and Gnome, both mature and complete desktops. In the past KDE has proved more popular, offering many more advanced features and a big selection of powerful applications.