Granted, I'm not from the *deep South* (although Kentucky isn't exactly Yankee territory, either), but I've never seen or heard of anything like you're talking about. It's a great idea, though--I'll have to suggest it to our rush committee for next fall! Usually on Bid Day, we just go around and hang "door decks"--ours are shaped like huge turtles and we decorate them with glitter and the pledge's name--next to the dorm room of each girl. But the girls who live off-campus don't get one...so I think the ribbons-on-the-mailbox idea is pretty cool.