After scrolling down to the footer, I found <a href="http://robohash.org/" rel="nofollow">http://robohash.org/</a> linked: "Robohash is a easy web service that makes it easy to provide unique, robot/alien/monster/whatever images for any text.
Put in any text, such as IP address, email, filename, userid, or whatever else you like, and get back a pretty image for your site."
I recall the original robohash thread. This is obviously something built using it. I'm mostly curious about how this made it to the #1 article with only 9 votes, in 20 minutes.