This probably isn't the right way, but I got past the Verne theme missing for KDM and desktop theme by just copying over the Lovelock themes into a new Verne directory. Otherwise I got something like "KDM theme /usr/share/kde4/apps/kdm/themes/Verne not found" and it wouldn't boot. I would've tried 'yum history undo XX' but logging into my internet is a pain.