If you have become tired of the standard color on you background at login then this might be the thing for you.

Edit the registry and add/update this (STRING):

[HKEY_USERS \.DEFAULT \Control Panel \Colors]
Background="58 110 165" (default)

The colour is configured using these settings:

Color	Red	Green	Blue
white	255	255	255
Red	255	0	0
Yellow	255	255	0
Green	0	255	0
Cyan	0	255	255
Blue	0	0	255
Magenta	255	0	255
Black	0	0	0

One can also change the background Wallpaper for the login screen, just use:

[HKEY_USERS \.DEFAULT]

Instead of :

[HKEY_CURRENT_USER]

More Info MS KB103327