For sure that would be a great idea. However I don't know if the Death Compagny would be fit for a signature Warlord Army card. Personally I feel the Sanguinary Guard would fit that role better.
Nontheless you guys can expect a Blood Angel design any time soon. Currently have their new Codex and will try to come up with something.
For some reason both the Blood Angels and World Eaters always peaked my interest for Warhammer 40K Space Marine Legions.