I’m guessing that it is (or some are) due to something like ball lightening. With the electrical fields concentrating in certain areas (like England) due to the geology (faults, magnetic materials, etc.) Others seem way too complex for that - however, snowflakes also make some pretty complex shapes and designs.
I seem to recall videos of a ball of light chasing around a field at night and then a crop circle the following day. I think with all of the hoaxes nowadays it takes some effort to figure out the hoaxes (crushed crops) versus real ones (bent crops, super-heated with nodes exploding, etc.)
if you go into the various links on her site and watch some of the videos, you do see her present the type of phenomena you describe. I don't know what to make of this, being a Christian — I rely on the Holy Spirit for direction. But as someone originally trained in design who went on to work in scenario development for a global IT company, I am quite interested by this, which I was not expecting to see on FR. God does move in mysterious ways. Just this morning I was thinking of a party I attended years ago where we cracked each other up joking about "crap circles", and lo and behold, today this article popped up here of all places.
The people who frequent some of the ET phenomenology groups appear to be mostly New Agers who do not believe in Christ, so I'm wary of that. But then again, few people really do believe; and very few have an accurate sense of the scale of the universe(s) over which the Triune God has dominion.