I'd go with a decent shade of purple and due to the character Drogyn being of the deeper well I'd prefer to see a large tree trunk with a wooden door. Like the one seen that Winnie the Pooh steps out from. The link to our Black Thorn is our dear young Gwen Raiden who I may now know her as Gwennie Poohs for all time.
AshSlays, did you notice what Nix wrote, our dear Nix. That she wants to be in our house and yet she knows to use capital letters for the name Black Thorn.
Keep doing those banners though not as I'd do them. Instead of the cat and the non existent black rose I'd put three House Cups.