I guess then we AOIIs would be in Gryffindor. . . Our colour is cardinal which is a red just as scarlet is a red. We don't have a 2nd color so. . . .
We could always go by the Quidditch team colours (I know it doesn't go with the original post comparing the AI sorority to Gryffindor. . . ).
Appleby Arrows: Pale blue with silver arrows (Pi Phi?, TPA?)
Ballycastle Bats: Red and black (AOII?)
Caerfilly Catapults: Light green and scarlet (AGD?)
Chudley Cannons: Orange and black
Falmouth Fallons: Dark gray and white
Holyhead Harpies: Dark green and gold
Kennmare Kestrals: Emerald green and yellow
Montrose Magpies: Black and white
Pride of Portree: Deep purple and gold (DPhiE?)
Piddlemere United: Navy and gold (AXiD? DDD?)
Tutshill Tornadoes: Sky blue and navy (KKG)
Wigtown Wanderes: Blood red and silver
Wimbourne Wasps: Black and yellow (Theta)
Quidditch Through the Ages doesn't give the colours for any teams outside the UK and Ireland so I'm not able to lengthen the list.
Guess I have too much time, huh?!
Sarah