Flickr Creative Commons: Creative Commons is a
non-profit organization that offers an alternative to a full copyright.
There are different types of Creative Commons licenses and each license
has its own set of stipulations, but the most basic requirement under
any Creative Commons license is that you attribute the author of the
image. Many Flickr users have chosen to place their photos under a
Creative Commons license. http://www.flickr.com/creativecommons/
Wikimedia Commons: Similar to Flickr Creative
Commons, Wikimedia Commons is a repository of copyright free images. The
site uses "wiki-technology" meaning that anyone can upload or download
an image. Because anyone and everyone uploads these photos, each
individual image may have different download requirements, like
attributing the author, but the majority of photos are free for download
without restrictions. http://commons.wikimedia.org/wiki/Main_page
A photo found on Flickr creative commons, from Flickr user laverrue
