Links - Images
Alphamarks: Image Collections

Wikimedia Commons: Images
WC is a collection of 35,390,214 freely usable media files.
Public Domain Clip Art.
This is a large collection of presumably copyright-free public domain images, recreation, people, cartoon characters clip art, animals, etc. But, as stated by their terms of use: the user must accept responsibility for using the images. So double check!
Pixabay: Free images and videos you can use anywhere
All images and videos on Pixabay are released free of copyrights under Creative Commons CC0. You may download, modify, distribute, and use them royalty free for anything you like, even in commercial applications. Attribution is not required. : public domain images, graphics
Created to provide easily- accessible, free images, graphics, music, videos, ebooks, audiobooks... All presented files are absolutely free for any kind of use - including commercial usage. You can use them freely without attribution.
Splitshire: Free Stock Photos & Images for commercial use
Authored by Daniel Nanescu, Splitshire is a source of absolutely stunning high-resolution photographs that can be freely download and used for personal and commercial purposes.
Public Domain Files: Free photographs, Clip Art, Artwork, Video Clips...
This is a HUGE source of public domain photographs, clip art, artwork, video clips, TV shows, and even fonts.
New York Public Library:Digital Collections
This site is a living database with new materials added every day, featuring prints, photographs, maps, manuscripts, streaming video, and more.
Discovery Education: Clip Art Gallery
Add graphics to your next project. Choose from animations, art, awards, food, fun & games, health & safety, language arts, letters, numbers, logos, mascots, math, music, science, seasons, holidays, social studies, special events, sports, technology...