Then I realized that I would probably end up picking half the cast of King Arthur, just because it's easier to visualize Vikings when they're already in medieval getup. Not to mention Stellan Skarsgård, who actually does play a Viking in the movie.
pretty scary stuff, huh?
Second realization: everyone else would have been in Lord of the Rings (i.e. Viggo Mortenson and Miranda Otto), or at least of Scandinavian descent.
My conclusions? There's a reason why I'm not in the film industry. But I do want to see King Arthur again (along with Robin Hood, Kingdom of Heaven, Lord of the Rings...)