Getty Images recently announced that 35 million of their highly acclaimed images would be available for "free" embedding... the only problem is that the actual implementation doesn't allow social sharing - a major requirement for most people using images today. I wrote more about this on my Disruptive Conversations blog at:

http://www.disruptiveconversations.com/2014/03/one-screenshot-to-show-how-getty-images-free-offer-fails-and-why-i-will-not-use-it.html