Change the Theme
Each version of Windows came with a default color scheme.
Windows XP has the Luna Graphical User Interface (GUI). The
Start button is bright green ("Green means Go!) and the title bars
at the top of the Windows are blue.
Windows Vista has the Aero interface. For the first time since
Windows 95, Microsoft completely redesigned the GUI. The Aero interface
offers
transparencies, live thumbnails, and a larger font (9pt).
Try it: Go to Start ->Control Panel
Find Appearance and Personalization
Click on Change the Theme