Yesterday I wrote a search plugin for Flickr. It’s searching for all content types (photos, illustrations, screenshots) which licensed under the CC and allowed to modify, adapt, or build upon.
Download flickr_photos_cc.xml and move it to:
Windows: C:Program FilesMozilla Firefoxsearchplugins
Mac Os X: ~/Library/Application Support/Firefox/profiles/xxxxxxxx.default/searchplugins/