Specify the 'Force a specific background and accent color for PersonalColors_Accent' (Color Code) Forces Windows to use the specified colors for the background and accent. The color values are specified in hex as #RGB. By default, users can change the background and accent colors. If this setting is enabled, the background and accent colors of Windows will be set to the specified colors and users cannot change those colors. This setting will not be applied if the specified colors do not meet a contrast ratio of 2:1 with white text. Counter Measure: Enable this policy setting to prevent users from changing the background and colors. Potential Impact: Users cannot change background and accent colors.

(1) GPO: Computer Configuration\Administrative Templates\Control Panel\Personalization\Force a specific background and accent color (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Personalization\PersonalColors_Accent,PersonalColors_Background