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Awesome source for photos

Almost all images taken from Wikimedia Commons will be under some kind of free license (usually CC-BY, CC-BY-SA, or GFDL) or in the public domain. Clicking on an image in any project will take you to the information page for that image. This will list information supplied by the uploader, including the copyright status, the copyright owner, and the license conditions

http://commons.wikimedia.org/wiki/Main_Page

Sample Wikimedia Photo
Tip: Use the provided HTML to properly attribute - See example below