
click to enlarge
Now, for the fun stuff! I will show you how to make some dramatic changes to the overall look-and-feel of your Ubuntu Linux desktop. You will find the Ubuntu Linux appearance preferences under the
System menu (located on the top panel) >
Preferences >
Appearance. This preference pane will allow you to make changes to your theme, background, fonts and turn on visual effects.

click to enlarge
The theme tab allows you to change your theme, including icons and pointers, to one of the included themes or you have the option of downloading and installing user created themes. The background tab, of course, is where you change your desktop background (wallpaper). The fonts tab is where you can set your default system fonts and, lastly, the visual effects tab is where you turn on some pretty impressive desktop effects.
Perhaps my favorite site for getting new themes is the Gnome-Look.Org website. This site is a major hub when it comes to user created themes, fonts, icons sets, mouse pointers, backgrounds, and more. The material is generally well done and the instructions on how to install the various themes is well documented. In most cases you can download the attached archives and drag-and-drop them onto the themes tab for auto-install.