From WinCustomize Wiki
LogonStudio lets users change their default Windows XP logon screen to one of many available for download. LogonStudio will also let you easily create your own logon that you can then share with the community.
How to use LogonStudio
The first thing you will have to do is download LogonStudio from the download links below. Once installed I recommend downloading some logons as LogonStudio only includes a few. LogonStudio files will have a .logonxp extension, but sometimes they may be included in a .zip file.
In the LogonStudio configuration window you will see a list of the installed logons, each with a preview. Under the list you have a few options such as load, new, edit, etc. Once you have a logon installed, simply choose it from the list and click the "apply" button and your new logon should be set.
You can always return back to the default Windows XP logon screen by clicking the "restore default XP logon button.
1.0, January 2005