Pinkie would represent Turodaron, with her love of entertainment and amusement. Others might find her to be very immature and naive.
Fluttershy would represent Sevestrana, that strange land in the far south. She might enjoy building those temples to Svarog and the gods among the jungles and highlands.
Rarity would represent Heronoja, those bizarre doll-people who worship the Moon and run from ice cream. Like the Heronoi, she might be prone to mood swings and panic.
Twilight would represent Tukshara, a land gifted with ancient wisdom and notorious for running a powerful empire.
Rainbow Dash would represent Marnos, a land of vulgar hooligans, daredevils, and brawlers - a spitting image of America?
Applejack would represent the Arnadjanai, a mighty race of lusty, violent nomadic barbarians. You better run from her before she steals your gold and keeps you as a slave!