Looking for public domain images? Try Pixabay.

"You can freely use any image from this website in digital and printed format for personal and commercial use without attribution to the original author.

[...]You can upload and share your own photos. Pixabay is available in 20 languages, thus the whole world benefits from your contribution!"

Take a look at the Editor's Choice http://pixabay.com/en/editors_choice/  
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