How to change the gdm-greeter background in F14?

[Bruno Wolff III]

On Fri, Sep 24, 2010 at 10:42:51 +0200,
  Joachim Backes <joachim.backes at rhrk.uni-kl.de> wrote:
> Hi,
> 
> in F13, I can change the gdm-greeter background by klicking with right
> mouse button in my desktop, saying "Change dektop background", select
> some  background picture and press "make default", so that picture was
> taken for the gdm-greeter too.
> 
> I miss that feature in F14 - how to achieve this in F14? Can I do this
> by gconf-editor?

On a machine I updated to F14, gdm still has the previously set background.
So the feature still works if you can get it set up.