I am so sorry that you even half to ask this question. Rushing at LSU must be hard core, I didn't realize it was this bad. When I was going to rush a social sorority I was told time and time again "be yourself". So my advice to you is to be yourself, if you feel you are the same girl with or without the nose ring just decide on what your best feeling is. Go with your heart. I know how hard it is to want to rush as an upperclassmen. I wanted to rush this year - lots of chapters at my school recommended it when they first met me and encouraged me to do formal rush instead of just COB. But then at the second event some of them found out I was in band(not that I'm ashamed at all), and that pretty much ended it for me.

Silly isn't it how just a little thing can change a person's opinion of you?
But in all honestly it was the best thing to happen to me. Because if I hadn't been totally ignored by some of the bigger sororities on campus I wouldn't have realized how terrific my service sorority was. Yes, I know we're a service and not social - but our sisterhood is kick butt! And if I shaved my head and got any kind of piercing on my face they would still love me! So thats what I want for you. These girls are going to be your sisters - don't ever hide yourself or be embarassed about something that is your identity.
Good luck! And I hope LSU realizes what a great girl you are!!