Deny Access to the Display Settings - This option disables the display settings control panel icon, and stops users from accessing any display settings.
Hide the Display Background Page - This option hides the background page, stopping users from changing any background display settings.
Hide the Screen Saver Settings Page - This option hides the screen saver page from the display settings control, which stops users having access to change screen saver settings.
Hide the Themes Settings Page - This option hides the Themes tab which prevents the user from selecting an alternate theme. Themes normally include a background plus sounds, icons and other elements.
Hide the Keyboard Navigation Settings - This restriction disables the "Hide keyboard navigation indicators until I use the ALT key" option in the Display Control Panel (see Appearance->Effects).