That's pretty cool. I was thinking earlier today on how to make some of these for some of my planned dios. I might still make the actual ones and use your print outs for the skirts. I remember being a young PFC in Bosnia and we got these after we had filled what seemed like a million sand bags. If I recall correctly (history lesson coming up) these were originally designed to help reduce erosion in Britain or Scotland possibly Ireland I don't remember. But they are a hell of a lot better than sand bags for larger areas.