Change onboard theme in unity-greeter

[nmangal@synexxus.com]

Any idea how I could change the way onboard looks in unity-greeter (Ubuntu 12.10) ? I can go to onboard-settings and select different themes. Typing "onboard" in terminal shows the updated keyboard (so does gnome lock page)...but not the unity-greeter.

Any clue on what configuration file I could tweak for the unity-greeter to show a different onboard theme?

thanks!
Nancy.