I think Alison Hendrix would do very well in Westeros.
George RR Martin ran into Orphan Black actors Kristian Bruun and Dylan Bruce at an SDCC shindig last night, and told them how much he loves their show. I can't help but think of all the amazing Game of Thrones/OB fanfic that could come out of this. Joffrey clones, guys. It could happen.