Quentin D’Souza over at teachinghacks.com spent some time back in September creating a list of Flickr accounts owned by educators. It’s in no way a complete list, but it’s sorted by age group (The age of the students, not the teachers!) and if you want to be added to the llist all you have to do is ask.
By the way, even though my own Flickr account is listed, I never asked to be added. Mr. D’Souza found me the old fashioned way – by looking.
Speaking of which, I should really update that thing. I have a ton of student art pictures ready to go, too – I just need to sort them.