I upgraded to Jessie using this guide but the
/usr/share/themes/PiX directory is missing. I also do not see Appearance Settings in the Preferences menu, which I believe is somewhat linked to the new theme.
From Googling I believe the executable is called
pipanel but I cannot find this via any of:
apt-cache search pipanel
apt-file search pipanel
dpkg -S pipanel
Where does the utility/theme come from?