Shut up, and TAKE MY MONEY!
I'm completely sucked in, fan fic to come. I know next to nothing outside of the kickstarter video, but I am absolutely feeling compelled to explore the possibility of this world.
Corlag the Bard
In the Heresy Era, the Thousand Sons marched to Godhammer on the recently-rediscovered Machine World of the same name. Their current crest/symbol emblazoned on their left shoulder plates is that of the ouroboros.
Food for thought...
http://wh40k.lexicanum.com/wiki/Thousand_Sons#.UFD23FTgLmE
http://mordian7th.blogspot.ca/2011/10/heresy-era-thousand-sons-march-to.html
and more on the ouroboros itself: http://en.wikipedia.org/wiki/Ouroboros