Yomaddog, Here is how to change the Login Screen Colour: "1. Click Start > click Run > type regedit > and click OK.
2. Navigate to the following registry key:
HKEY_USERS\DEFAULT\Control Panel\Colors
3. In the details pane (right-side), double-click the Background string value item.
4. Change the value to a 3 number RGB value, and then click OK .
You have now changed the logon background color.
NOTE: I went looking for this registry key after using the "Change the Logon BackGround" tweak, and that bright XP blue color kept showing before the OS had a chance to load my dark wallpaper. This way if you choose a color close to the wallpaper shown, the load of the wallpaper is less noticeable. "
Here is how to change the Login Screen Background: "Change the Logon BackGround
1. Click Start > click Run > type regedit > and click OK.
2. Navigate to the following registry key:
HKEY_USERS\DEFAULT\Control Panel\Desktop
3. In the details pane (right-side), double-click the Wallpaper string value item.
4. In Value data , type the path and name of the picture or background, and then click OK .
IMPORTANT: Make sure that you specify the path correctly to the Background.
You have now changed the logon Background."
I can't seem to find a way to change the boot screen, but I'm sure there is a way somewhere. You might want to have a look for yourself. I suggest going here
http://members.aol.com/axcel216/ and then scrolling down to the large list of WinXP tip sites. I'm sure one of them will tell you how.
EDIT: I forgot to mention the 2 quotes I had were from
http://www.tweakxp.com