I played with opensuse 13.1 KDE and I have done some damage...
in particular, there's no way to get back the default icons, both Crystal and Oxygen are missing icons and some icons are still present from a theme (http://kde-look.org/content/show.php...content=165154) deleted. I've also removed font cache, but nothing change.
It's possible to extract the standard icons from the installation DVD?
I would try to fix those in /usr/share/icons/ with the one from DVD.