As you may have noticed, Qt apps no longer use GTK+ theme in Xubuntu 11.10. For me this became particularly noticeable in Psi+. The problem is caused by QGtkStyle, which cannot find GTK+ theme since Xfce stores it in an unusual location (not sure why 11.04 could find it though).
To fix the problem add the following to ~/.config/xfce4/gtkrc
(create the file if it does not exist):
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Create ~/.config/xfce4/xinitrc
and add the following to it:
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After relogin all Qt apps will use your current Xfce GTK+ theme.