While I love all things Alpha Xi Delta, I can't get worked up about the beauty of our pledge pin in particular. It's not terribly symbolic either. It's like Chi O's but with pointy ends (and of course our letters).
You can see it here
http://www.alphaxidelta.org/insignia.asp
ADPi's is really nice. So is A Chi O's. And I like the A Phi ivy leaf.
Any Theta Chi's with scanners? I know their pledge manual has a photo of the NPC pledge pins, albeit mis-labeled with the badges photos!