Where are the failed crop circles?

So I see where pi is represented to 10 digits as a fractal-based crop circle. And I think to myself, “Hey, that’s cool.” And then I think, “Man, there’s a hundred different ways I’d mess up attempting that.”

Which got me wondering if anyone’s gone to the trouble of cataloging the screw ups of the crop circle world? While some are unexplained, many are known as hoaxes or even simply just examples of how to do it. I guess I’d be most interested in the unexplained ones (weaving of stalks and all that chicanery) that appear to have been executed poorly.