Anyway... I sent the wrong picture. I meant to send the statue of liberty one from Fresno. There are tons of these.
The company that makes the corn mazes has duplicated crop circles. Most can be accomplished in a few hours with a number of people. They pick corn fields which are planted with good separation between the stalks. (Millet, popping corn and sorghum aren't good choices.) That way they can squeeze between the stalks without leaving trails and foot prints.
I don't know how many of the crop circle believers have spent any time in a corn field, but you can maneuver around a mature one pretty well without knocking down any stalks.