BackGround Colors/Winlogin

Change the Windows Logon screen background color

With no logon wallpaper set, Windows displays a pre-defined color for the logon desktop. ( If you have enabled Welcome Screen, press CTRL+ALT+DEL twice to see the logon screen background color. ) To change the logon background color to that of your choice, you need to alter the registry:

        HKEY_USERS\.DEFAULT\Control Panel\Colors
      Example: Type 0 0 0 if you want to see a Black background. You can choose any combination from 0-255

Points to ponder

     HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon