I had to try this, so while I was at it, I made an RPM with checkinstall ...
Install the RPM, with Kpackage, YaST or execute "rpm -Uhv Geramik-0.03-1.i586.rpm" in a shell.
Then copy /usr/share/themes/Geramik/gtk/gtkrc to either /etc/gtk/gtkrc or ~/.gtkrc
Note! Default font in kderc, does not look very good on GTK programs.
I replaced font=xxxx,x,... in my .kderc with font=Helv,x,... and it's far more readable and it doesn't seem to affect KDE.