gksu -u gdm dbus-launch gnome-appearance-properties
You can set the theme, background, etc just like the appearance
properties in regular GNOME.
UPDATE: Obviously this relies on GNOME being installed. If you don't have GNOME installed, you can use this nifty little trick on Karmic:
sudo add-apt-repository ppa:gdm2setup/gdm2setup
sudo apt-get update
sudo apt-get install python-gdm2setup
(from: http://www.ubuntugeek.com/gdm2-setup-a-login-interface-management-utility-for-the-new-gdm.html)
You should now have a menu entry under: System / Administration menu as “Login (GDM2Setup)
I tried it but it seems quite experimental : many I/O errors with files and directories apparently not existing. Worked a half. Theme could indeed be changed, along with wallpaper but that's almost all, changes on polices won't be saved and so on... But this is quite a good surprise, hope they keep working on it. Thx for the news anyway !
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