How to Replace Ubuntu’s Default Brown Login Window

When you customized your Ubuntu desktop to replace the brown theme, you may have overlooked the login window. GNOME’s login window, called GDM (GNOME Display Manager), can be easily customized by installing themes.

You can choose a GDM theme you like from GNOME-Look’s GDM category. I use the “Sky is the limit” theme:

On the theme’s page, click the link to download it and save the file to your desktop. Open System->Administration->Login Window. Select the Local tab. Now drag and drop the theme file from your desktop into the theme list.