Changing Login Screen Background?

Is there anyway to change the desktop picture that displays behind the login screen?
Thanks.

The filepath for the image is HD/System/Library/CoreServices/DefaultDesktop.jpg.
However, it isn't wise to mess with system files and folders. The correct method would be to tell Mac OS X that you prefer a different default Desktop image. To do that open the terminal and enter the following command:
sudo defaults write /Library/Preferences/com.apple.loginwindow DesktopPicture “/Library/Desktop Pictures/Aqua Blue.jpg”
where “/Library/Desktop Pictures/Aqua Blue.jpg” is the path to the image you want to use.

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