"And fill me from the crown to the toe topfull of direst cruelty." This is a symbol for lady Macbeth wanted to get rid of her womanly qualities of being kind and sweet and have it replaced with cruel intentions and bloody thoughts
At his day job, Darren Crescenzi is a brand designer for Nike. In his free time, he probably designs interesting things like these re-done Game of Thrones house sigils. The finished set is 42 crests on a poster available for purchase.