Based on original work by A. Degen from his comic, AREACC. (and cropped out of the full-size version here: http://www.flickr.com/photos/max-capacity/7790040290/in/photostream/ )
which you can buy here:http://www.snakebombcomix.com/
or follow him on tumblr here:
http://adactivity.tumblr.com
http://maxcapacity.tumblr.com/post/29518701552/based-on-original-work-by-a-degen-from-his-comic