Listed below are several resources for finding NASA pictures. Currently this searches against an archive of over 300,000 pictures. Searching is performed using keywords. NIX returns thumbnail sized images, textual descriptions, image numbers, links to higher resolution images, and links to the NASA Center that stores each image. In the NASA Educational Products area of Spacelink you will find several lithographs of interesting NASA topics.
Lithographs are photographs or artists' drawings.
The second page of the lithograph contains text about the image and may include classroom activities. Multimedia galleries contain links to NASA pictures as well as video, audio, and other related resources.