Buzzfeed has a compilation featuring the likes of this beauty for House Stark:
There are even bonus rounds for House Reed and Melisandre!
Of course, I've been following these types of patterns for a while. The tumblr Style of Westeros is one of my favorite places on the interwebs, offering consistent and accurate and terribly fun character matches. Like this one for Cersei:
Of course, if you just want to go the literal route, here's a Khaleesi tutorial: