We need more greek letters! Either that, or we need to start using 4 letters. Although, I'm hesitant to recommend anything that's being done by Sigma (stole our nickname) AEPi on 'Sorority Life'.
Edited to add:
I don't think anyone else explained the door decks; the sorority puts them up on the new members' doors while all the new members are at bid day at the sorority house. When you get back to your dorm (apartment, house, etc.) it should be hanging on the door. I think ours are the coolest 'cause they're wooden, not paper, and in the year I've had mine I haven't managed to do any damage to it.