FlickrCC

With FlickrCC (Flickr Creative Commons) you can easily find photos on Flickr that were released under the Creative Commons license. Just enter a word(s) into the textbox. Click on 'find' and you'll get all photos with a CC license that match all the search word(s) in the picture's title, tags or description.

The panel on the left displays the first 36 matching photos. Click on any of these thumbnails to get a slightly larger image and the attribution details displayed in the right hand section.

Right click the image and 'save image as' if you want to use this size, or click on the link in the attribution text to go to Flickr and chose a different sized image. Don't forget to include the attribution text in any work you produce using the picture.