I post my photos on Flickr (some mildly NSFW) under a Creative Commons license. They can be used freely as long as there is attribution. The photos below are examples of such use that—while perfectly legal—I found amusing, given the context.
Some uses of my photos were on Lifehacker, Fast Company, Business Insider. I found them because they kept proper authorship, as per license.
All links are to the original photo page instead of the article. All photos feature the lovely Ivana Vasilj.