They're created by Anthony Herrera (who has his own design website: http://anthonyherreradesigns.com/) and frankly, they're awesome.
Below are some of my favorites (see bottom of post for link to download designs):
See (and download!) all of them here: http://anthonyherreradesigns.com/index.php?option=com_content&view=article&id=60:star-wars-snowflakes-2012&catid=34:anthonydesign-blog
