Till Windows Vista & Xp there was no support for changing Login Screen background and you have to use third party apps like logon studio for changing login screen background. However in Windows 7 Microsoft has done good job by allowing users to change Windows 7 Logon Screen without need of third party apps.
This is another cool utility Windows 7 Logon Screen Rotator developed by one of Neowin forum member which lets you to rotate Windows 7 Logon background screen randomly.
You can select upto 10 images and Logon Screen Rotator will automatically rotate your Windows 7 logon screen.
Logon Screen Rotator Download:
https://briteccomputers.co.uk/downloads/LogonScreenRotator.zip
Windows 7 Logon Backgrounds Download:
https://briteccomputers.co.uk/downloads/win7logonbk.rar
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There is a way to do this including videos?
Thank you.
Best Regards.