Leopard - Change Login Background

Find Default Desktop

Leopard stores the default login background in the form of file named DefaultDesktop.jpg. This file is exactly located inside Macintosh HD ▸ System ▸ Library ▸ CoreServices ▸ DefaultDesktop.jpg. As you expected from Leopard, your DefaultDesktop.jpg is actually Aurora.jpg by default.

Replace with New Background

After you spotted the file, change it to other name, such as ExDefaultDesktop. Then, drag the new login background into the folder and change the filename into DefaultDesktop.jpg. Next time you log on your Mac OS X Leopard, you should get your new login background.