Scott Dempsey would like to share this with us. He writes:

[This] is the Seattle Krakens. In the interest of attribution, the teal color and elbow pattern come from the Seattle city flag. That pattern reminded me of tentacles, which reminded me of the very nice House Greyjoy sigil from Game of Thrones. I changed it a bit, and I couldn't find an artist to attribute it to, but that's where it comes from.

As an Emerald City resident, I am sufficiently freaked.