This how Evolution looks like on Kubuntu 11.10 (Oneiric).
To fix this, make sure this package is installed: “humanity-icon-theme”, then create $HOME/.config/gtk-3.0/settings.ini
[Settings]
gtk-fallback-icon-theme = Humanity
Restart Evolution, and it should be fixed.
Credit: [solution] Evolution in Kubuntu 11.10
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the solution should be not to use evolution.