Setting Default Theme

[moe]

I'm working up the mailing list food chain for an answer to this as I haven't 
been able to figure it out...

What file contains the default system theme? I mean, when you add a new user, 
they get that theme automatically instead of Bluecurve.

I've changed a number of files, but they don't do the trick:
/etc/gtk-2.0/gtkrc
/etc/skel/.gtkrc
/etc/gconf/schemas/desktop_gnome_interface.schemas
/etc/gconf/schemas/metacity.schemas
/usr/share/themes/Default/gtk/gtkrc

I have heard a couple of suggestions on ways to try to get around it (e.g. 
drop some other files in /etc/skel), but I want to do it the redhat/fedora 
way. Somehow, somewhere ya'll set the theme--where does it hide? :)

Anyone?

Thanks,

-Jeff