Change the Windows Logon screen background color

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:

Click Start, Run and type REGEDIT and press Enter

Navigate to the following key:

HKEY_USERS\.DEFAULT\Control Panel\Colors

Backup the registry key by exporting to a REG file

In the right pane, double-click Background

In the Edit String dialog box,
type the Color code in R G B format and then click OK.

Thats it

                                                     Source: ♠ Hacker Is Better ♠