Hypothetically, would you be more interested in a roll of toilet paper with decorations on both sides than one without?  In a way, I still want these bills to be like toilet paper - thrown away after a single use.  If we make them too pretty, people won't want to throw them away!  Totally kidding. I asked for a single side design because my expectation was that people should be able to print these quick-and-dirty as though it's a form of "cash" and printing it were more convenient than taking a trip to an ATM, which is less convenient if you have to flip over a page and print both sides.  I have published the vector art within that SVG HTML file, so it should be quite trivial to take my front side and make a matching style backside if someone's interested in doing that.