Ok, I've wanted to do this for a while so here goes. Caveat: There were only 5 sororities on my campus so I don't know a lot about some of them, but I'll do my best!
Alpha Chi Omega- One of my best friends is an Alpha Chi and swears that had I rushed at her school, they're where I would have fit in the best. Whether or not that's true, I love the lyre and the history is so cool!
Alpha Delta Pi- My mom's an ADPi and I love the Ronald McDonald house as a philanthropy. Also, Alphie is a sweetie!
Alpha Epsilon Phi- "Many hearts, one purpose" makes me smile because it's similar to Sigma Kappa's "One heart, one way" and I am of course biased in that direction. Also, your support of the Chaim Sheba Medical Center is awesome for the hospital's non-discriminatory treatment. Something that is taken, mostly, for granted here and now.
Alpha Gamma Delta- Heraldry fascinates me, and your armorial bearings are, I think, the most subtle in their meanings. Plus, SQUIRRELS!
Alpha Omicron Pi- I love the "red" focus. Cardinal (color), Rose, Ruby... all deep gorgeous reds. Ok, and Pandas are cute too. (Since it's unofficially a mascot, would you consider the Red Panda?)
Alpha Phi- I like the Ursa Major, Phi bear connection! Plus you were the first to build your own house!
Alpha Sigma Alpha- Wow, knew nothing about ASA til now but the breadth of the symbolism is fantastic. I love the multiple exemplars and colors and everything. Plus the phoenix is very very cool to a mythology nerd like me.
Alpha Sigma Tau- I like the change from Fraternity to Sorority and that some chapters kept the first. I also like the candle atop your Coat of Arms. (Plus Green and Gold, plus the original purple makes Mardi Gras!)
Alpha Xi Delta- The quill is the sign of a scholar, something I respect greatly! Same as the motto "The Pen is Mightier than the Sword"
Chi Omega- The whole skull thing has always fascinated me, in that morbid way. So I am of course curious. Make a Wish foundation is a noble cause and one that can break your heart so kudos for ChiOs for their hard work.
Delta Delta Delta- My little sister just pledged! I have to say, the trident guard is really unique and cool, though I want to ask if that is more common than having a chapter guard or vice-versa?
Delta Gamma- Do Good is a fantastic motto and Hannah is cute! Also I think the fact that you have a real Delta Gamma rose (or at least had, hopefully you have again) is great!
Delta Phi Epsilon- I love that Justice is one of your principles. Also, I have a fondness for triangle badges and the color purple, but beyond that anorexia is a great philanthropy
Delta Zeta - My grandma is a DZ! She always said in school they were called the "dizzy" girls and it still makes me giggle! The lamp is a sign of wisdom, also to be admired!
Gamma Phi Beta- I think the set up of your colors is fascinating. The colors themselves are unique, but then the use of unofficial colors, chapter colors, etc is cool. Our campus used pink predominantly, though the DGs felt jealous!
Kappa Alpha Theta- Very cool looking badge! And I love the attitude of your founders, "If you won't initiate me into your fraternity, I'll start my own!"
Kappa Delta- First off, your Coat of Arms is so... complex! From the snake to the dagger to the one part of green to the lamp... very cool. (Oh yeah, and skull too!) I recently learned the nautilus shell is an example of a perfect spiral so I thought that was cool!
Kappa Kappa Gamma - What can I say, I think the key is cool, the focus on the blues is great, and as a (temporary) St. Louisian, I have quite the fondness for the fleur-de-lis.
Phi Mu- "Soeurs Fideles" and Sir Fidel is great! The quatrefoil symbol and badge are also unique and cool, and I was wondering if the ladybug comes from the look of the quatrefoil symbol in the middle of your coat of arms. I swear I can see a ladybug there!
Phi Sigma Sigma- First off, cool badge. The sphinx is a feminine symbol of cleverness and mystery and the sapphire's just stand out, going well with your colors. And need I mention that alleviating the world's pain is one of the coolest purposes/mottos I've seen? No, I needn't.
Pi Beta Phi - Something about the arrows has always intrigued me. And can you say, 12 founders? I'm glad I wasn't studying for that new member test! From the heraldry side, your crest is interesting in that it doubles as your coat of arms and is not standard in shape or content.
Sigma Delta Tau- Very interesting colors, and Prevent Child Abuse is a very worthy cause. I'd like to say more, but your site won't load
Someone fix it!
Sigma Kappa - What can I say, where my heart is happiest. The dove, the pearl, the violet, the heart, lavendar, maroon... what could be better? Nothing!
Sigma Sigma Sigma- Sigma Kappa and Sigma Sigma Sigma have much outwardly in common, enough that people keep thinking we're related! While I know better, I love that we share the triangle badge and purple and the violet. Something always attracts me to Sigma Sigma Sigma and I wonder if in another life that's where I'd be... I also like that you have an official ceremonial song!
Theta Phi Alpha - The compass is a cool symbol, and penguins are absolutely adorable. I also like that there is a Catholic background to your fraternity.
Zeta Tau Alpha - Interesting choice of Themis and the carpenter's square also intrigues. I also think it's cool that though many sororities are fond of violets, you're the only one with a white violet!