Beautiful stock photos, all CC-0. Modify, copy, and distribute the photos however you want.
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Tons of images in the public domain that are searchable. You can pay for premium downloads.
A small collection of 2000 stock photos. The organization is a little peculiar, but the photos are very good.
Clip art, photos, and illustrations that are all released under Creative Commons 0! http://www.pixabay.com/ “All images on Pixabay are released into the Public Domain under Creative Commons CC0. Therefore, the images can be modified and may be used freely for any application – also commercially and in printed format. Attribution in appreciated, but not required.”
One of the best places to go online for professional grade, CC0 images.