Well, I have a surprise - The default login screen in Windows 2008 can be changed by following the same procedure found here >> How to change the default Vista Logon Screen? - though it was originally intended for Windows Vista, but a few folks tested this out on a Windows 2008 Box and found it to work perfectly as expected.
Here are the screenshots below:
Click on Screenshot to Enlarge
Before applying the steps:
After applying the steps: