How do I apply a custom Gnome-shell theme for all users?

I am using Gnome-shell on Ubuntu 11.10. I've found excellent theme, which I'd like to apply to all users, current and ones that are created later. Is there a way to set the new theme (Elementary Luna) as the default theme, or if not, replace the old theme completely?

Put your configuration files into /etc/skel. The window theme settings are located at /home/YourUsername/.gconf/desktop/gnome/shell/windows/%gconf.xml so you copy the settings file to /etc/skel/.gconf/desktop/gnome/shell/windows/%gconf.xml.

Then you do the same for .gconf/desktop/gnome/interface/%gconf.xml, this is where icon theme and gtk-Theme settings are stored.

You can do so with all settings in your home folder.