This works well but is a bit tricky to implement
Jeremy
I also I believe that MS will be implementing an automated approach to changing the logon screen with the final release.
How to customize logon background/screen in windows 7
May 7th, 2009
If you don’t like the default logon background of windows 7,or you want to change the background to a picture you like,you can do it easily in windows 7 without any third-party softwares.Below will give you a simple guide about how to do it.
1.First launch regedit then go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background
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2.Change the vaulue of OEMBackground to 1,which indicate to enale logon background customization in windows 7
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Tip:If you can not find this entry in your registry,please try to create one.
3.Go to %windir%\system32\oobe\ ,create folder info then create another folder backgrounds under info,then copy your own background picture here and rename it to backgrounddefault
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Note:The size of this picture must be less than 256k ,or it will not work.
4.Done,you can see your new logon background after logoff.It’s so easy,isn’t it!