Right click on the desktop and select Personalize.
Right click on your new theme and select Save theme for sharing.
Save the theme to your Documents area with the file name myprefs.themepack.
You must use this name for the settings to apply on other computers.
This saved theme will be applied whenever you log on to a computer using the Windows 7 managed Service (in a Computer Lab or a Staff managed computer). You can make changes and re-save the theme at any time.