This collection of custom House Sigils for George R. R. Martin’s Game of Thrones series are the work of Justin Conway. He even manages to make the fish of House Tully look impressive. His Behance page says he’s currently only 17. So young! It also states an ambition to make a living out his his art. Based on this sample it should be possible!
These Game of Thrones designs are 100% vector made in Adobe Flash.