My Bid Day shirt (Fall 1998): "You only live once, but if you live right, once is enough. The day the best got better."
Fall 1999: "Sometimes the best way to figure out who you are is to go to the place where you don't have to be anything else."
Fall 2000: "We laugh, we cry, we make time fly, best friends are we, my sisters and me."
Fall 2001: We had a Ron Jon surf shop theme, and on the back it had their symbol w/ AZD letters in the middle, and below it still read "One of a Kind."
Some of the other sororities on campus had ones that read, "It's not who you've become, it's who you've always been." and "If you're going to be Greek, why not be a Goddess?" That was so long ago that I don't really remember any others.
Wingate did one last year that was a baseball tee w/ "Alpha Xi Delta" and "Spring 2004" on the front, and it had a cute quote from DMB on the back (that of course I can't remember at the moment). In Fall 2003 they had one that read, "I saw the rest and chose the best!"
HTH.