Not the product of aliens, but the works of San Francisco-based artist Andres Amador, these patterns in the sand were inspired by crop circles.
"Amador is pioneering a new art genre: crop circles in sand. They are quick, temporary, cheap, spectacular, and fun. And anyone can make them. You can roughly see how the patterns are produced in this very low-res video. Andres first uses ropes to sketch out the outines of the dark sections. He then returns to those guidelines and uses a rake to rough up the sand within those lines in order to make the pattern."
Implications - The crop circle is now a recognized part of pop culture because of the mysterious intrigue it represents.