There is currently a discussion at the village pump over redesigning the placeholder images:
http://en.wikipedia.org/wiki/Wikipedia:Village_pump_%28proposals%29#Redesign...
May be of some importance given how many pages these images now appear on and that they are starting to appear on other projects.
At the same time I would be interested in knowing if there are any wikiprojects that think this could be useful for finding images relating to their area and are prepared to deal with the uploaded images.
A sample of the images uploaded (not all they keep disappearing off to commons) can be found at:
http://en.wikipedia.org/wiki/Category:Fromownerviewed