I love to look at crop circles. After viewing so many, I came up with a theory that crop circles are artwork. Maybe the aliens aren't trying to communicate so much as filling that creative need that we humans also have. I think this because there are a few definite artistic styles. If aliens share the artistic urge as we do, wouldn't that be a wonderful thing?
They may be heiroglyphic attempts to communicate through symbolism, as many people have said.
But I like to think of them with individual personalities, like us.
Art is a reflection of the soul.