If you’re looking for images that can be used freely try the search function on the Creative Commons website.
The search can be narrowed to look for those images that can be used commercially, as well as images that can be modified.
It searches common sites such as Flickr, Google Images, Wikimedia, and Fotopedia; unfortunately, each site must be searched separately. Even though images have been cited via the search function, it’s always a good idea to verify the license before using the images commercially.
Try it at http://search.creativecommons.org.
Jay Nelson is the editorial director of PlanetQuark.com, and the editor and publisher of Design Tools Monthly. He’s also the author of the QuarkXPress 8 and QuarkXPress 7 training titles at Lynda.com, as well as the training videos Quark includes in the box with QuarkXPress 7 . In addition, Jay writes regularly for Macworld and Photoshop User magazines and speaks at industry events.