It shouldn't be too much of a pain to do. I do something like this on http://thingist.com (Not caching facebook photos, caching the randomly generated 3x3 pictures that it gives you if you don't connect with facebook [the script to generate the pictures is expensive])
The python to do it would look something like this:
You can easily identify anyone by viewing the source of their FB pic. For example:
profile ID is 665523839, which you can plug in to see all their details: http://www.facebook.com/profile.php?id=665523839