The jist of what you are saying is that crop circles a made with lawnmowers, right? Gee, I suppose I could go make one out in my yard. I feel sorry for the person who had to mow THIS yard...
Incidently, it was reportedly RAINING the night of August 13, 2001 in Wiltshire, UK. That is the date and location that this crop circle was created! Hard to mow a lawn in the rain, especially without leaving footprints, of which there weren't any...