"The Commons" - new Flickr feature of public photograph, many with no known copyright restrictions. Many world-wide institutions participating by contributing their collections to this online tool! Great for in classroom to generate discussion, debate, etc!
A curated list of websites that offer free (legally!) photographs that you can use to draw and paint form. The photographs come from amateur and professional photographers who dedicate their work either to the public domain or under a Creative Commons Attribution license. There are some truly stunning images to choose from. Enjoy!