Not every Theme might work, but many will.
I included 8 Themes, 6 are (nearly) similar on Gtk and Gtk2, to give your Desktop a "coharent" look.
This Dotpup will install files to your system folders:
/usr/share/themes
/usr/lib/gtk/themes/engines
/usr/lib/gtk-2.0/2.4.0/themes/engines
I grabbed these libraries from several different RPM-Packages.
If you have other working engines, post them please, I could create a second dotpup.
Bugs: the bluecurve-themes cannot find some icons, but display is ok.
Just in the console they show many warnings. Must correct that.
Preview (click on the links for larger view):
Gtk1:
http://noforum.de/dotpups/gtkthemes.jpg
Gtk2:
http://noforum.de/dotpups/gtkthemes2a.jpg
http://noforum.de/dotpups/gtkthemes2b.jpg
Download:
http://www.murga.org/~puppy/viewtopic.php?p=12886#12886
Mark