Started off with a fresh KDE4 (upgrade from Fedora 8), and all colors/decoration/... looked good. Switched to e.g. the dark theme with high contrast, to find out what it looked like. However upon changing to any other theme, settings like monochrome for icons and some dark color-settings remained ... no matter to what theme I switch. So currently I tried to switch to a light "KDE Classic", but still have e.g. each second line in krusader viewed with a very dark blue background and black text on it. Also had to set icons to e.g. "Gamma" instead of monochrome etc.
This is a good candidate to report upstream to bugs.kde.org instead.
Checked upstream could not find matching bug. Please file upstream and add bug information to this report
cross-reference to upstream-bugreport (just created): http://bugs.kde.org/show_bug.cgi?id=162125
Thanks! We'll continue to track things there.