FAQ is HERE

It was a given that Supernatural would be on the blanket, but what to put on the square was a hard choice. It’s a show that is just rotten with symbols. You can’t swing a dead cat on that set without running into something that would look good on the blanket. We considered them all. Maybe you want your blanket to repulse rogue Angels. Maybe you want it to be protected from possession. Maybe you want it to trap demons. We narrowed the field to eight or so front runners, but ultimately we decided to go with the Tulpa.

The Tulpa is a Tibetan symbol and concept in which a creature is conjured by the sheer will of spiritual and mental discipline. In the episode “Hell House,” it was used to create a homicidal ghost by a bunch of people on the internet, and it was what first brought Sam and Dean together with the Ghostfacers. (Just so you know, I would watch a whole spin-off about the Ghostfacers. They’re awesome.) I like the idea of putting a thought form on the blanket. Think good things while you’re knitting the Tulpa, and it will manifest them for you while you sleep.*

Castiel, Castiel, Castiel