Hello,
there were at least two recent conversations about the theme
settings:
http://thread.gmane.org/gmane.comp.kde.digikam.user/18836/focus=18842
http://thread.gmane.org/gmane.comp.kde.digikam.user/18958/focus=18970
Basically you need to install the package 'systemsettings' in
order to change some KDE settings. After installing, you will find
the entry 'KDE System Settings' in Ubuntu's Dash -->
Application Appearance --> Colors
Hope it helps
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