Lots of stuff I never knew here...
http://earthsky.org/earth/these-are-von-karman-vortices?utm_source=EarthSky+News&utm_campaign=d8966f2fbf-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-d8966f2fbf-394047101
I'm hoping someone here can figure out how to do them. A curious challenge.