You can use desktop preference tools to configure almost every feature of the desktop. Each tool controls a particular part of the behavior of the desktop. For example, you can use a preference tool to select a theme for your desktop. A theme is a group of coordinated settings that specify the visual appearance of a part of your interface.
For convenience, the tools are grouped under the following headings:
Basic
Accessibility
Advanced
You can open your desktop preference tools by going to Applications -> Desktop Preferences and choosing the item that you require from the submenu.