What do non-man made crop circles mean?

I know some crop circles are human made but I have actually witnessed(along with two other sober adults) during daylight hours a huge UFO saucer looking vehicle... within a mile...
I reported it to MUFON but never heard back from them. Is it possible that some of the crop circles are made by whomever is operating UFO's? I have not done too much research about crop circles but if some of them are not human made then what do they mean? What are they trying to communicate to us? Does anyone know how to simply explain their meanings to someone who is not aware of their meanings? Is there any hope or healing messages?

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