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Just passing this along courtesy of wstephenson:
Delete the monochrome icons that the system tray widget substitutes for those set by the apps using the tray, and the colourful originals will be used instead (I know because I mispackaged these in openSUSE and discovered the fallback behaviour).
The standard location for them is
kde4-config --prefix/share/kde4/apps/desktoptheme/default/icons/
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