Art + Feminism Wikipedia Edit-a-thon

Large collection of public domain and Creative Commons images, sounds, maps, and other media.

Search images, sound, and video that have Creative Commons licensing. Includes Google Images, Flickr, and others.

This link brings you to the Advanced Search page. Place your search term in the box, then scroll down and check the box to search "only within Creative-Commons licensed content." If you wish to make any changes to the image, you'll also want to check the "find content to modify, adapt, or build upon" box