We also use it in hildon-desktop, in hd-backgrounds.c IIRC. I checked my Cordia version but evidently they ripped it out. The few examples I came across were gnome-main-menu, which has now disabled the code as they were using it for thumbnail generation.

I haven't looked at hildonfm yet. The thumbnail code ripped out of hildon-home and hildon-thumbnail I was going to take a look at xfce as their generator is a descendant of ours.

I'll try and find some more examples.