This is the $52 Knit Your Own Unicorn Trophy kit designed by Sincerely Louise and available from Firebox. The kit is aimed at intermediate knitters (sorry beginners, but yours will turn out poorly) and comes with everything you need (including patterns, yarn, stuffing and needles) to make a life-size unicorn head to hang on the wall like a trophy mount. That way when your friends come over they can congratulate you on killing the last unicorn. "Hey -- check this out." Wow, way to go Voldemort, what the hell's wrong with you?
Keep going for a few more shots including one with a person for scale.
Thanks to Stephanie B, who agrees there should be a whole line of mythical beast wall mount knitting kits. I want an ogre head!