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[TJ <ubuntu@xxxxxxxxxxx>]

>From my initial exploration it looks as if this is governed by the Free
Desktop Icon Theme specification:

http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#directory_layout

"Icons and themes are looked for in a set of directories. By default,
apps should look in $HOME/.icons (for backwards compatibility), in
$XDG_DATA_DIRS/icons and in /usr/share/pixmaps (in that order)."

There's more to read at the link.

I think therefore it'll cover all bases to check the environment for
XDG_DATA_DIRS and if it is defined check "XDG_DATA_DIRS/icons/" for the
named icon. If not, use the default "/usr/share/pixmaps/".

I bet there's some higher level service to call on for this somewhere
but I'm not sure where to look right now - gtk maybe?