Then I don't qualify as a dinosaur. :) Jeans and t-shirts were the norm in class.

I've probably seen the pledge pins of most of the orgs that were on campus when I was there, as fraternity pledges were required to wear them at all times minus the 4 S's, and sorority new members were "highly encouraged" to wear them similarly, even if you were in a t-shirt and jeans.

As for badges, I've seen the badges of all five NPC sororities represented at my school at the time: Alpha Phi, Alpha Chi Omega, Sigma Kappa, Kappa Alpha Theta, and (obviously) Alpha Epsilon Phi. During rush, even if the actives were wearing letters and jeans or whatever, the alums checking us in were in badge attire. As for fraternities, I have seen my sisters' formal dates wear their badges - I can't give an exhaustive list but AEPi and ZBT were among them. I've also seen APO service pins as one of my AEPhi sisters is a brother and I briefly dated a brother.

My grandmother-in-law is a Kappa Delta Pi and always wears a pendant with letters. I don't know enough about the organization to know whether that's their official insignia in lieu of a badge or if there's a badge as well.

Does Masonic insignia count? My FIL gave my husband a Masonic ring on the occasion of his third degree. My husband gave it to me when he proposed. (Actually he proposed with his class ring, but it was too big even for my middle finger, so he gave me his Masonic ring (a pinky ring) which fit my ring finger just fine. I wore that until we picked out my diamond engagement ring and it came back from being resized.) For a while, DH drove his father's old car, which had a Masonic emblem. He has not placed an emblem on his current car, as I've threatened to put an AEPhi bumper sticker right next to it - but I digress. :)

I've seen
Kappa Kappa Psi
Tau Beta Sigma
Chi Omega
Tri Sigma
Alpha Chi Omega
Alpha Epsilon Phi
Sigma Delta Tau
Delta Upsilon
Alpha Delta Phi
Phi Sigma Kappa

Jeans were fairly standard for us, too, except on Pin Day, which we had once a week for all of the sororities. But if you got pinned, you made excuses to dress up to wear it! That said, we were a bit less strict about having to be in pin attire to wear our pin. To this day, I'd rather see someone in a nice outfit with good jeans than to see a pin stay in its case.

My list:

Sororities:
Chi Omega
Gamma Phi Beta
Alpha Xi Delta
Zeta Tau Alpha
Alpha Phi
Alpha Omicron Pi
Alpha Delta Pi*
Sigma Sigma Sigma*
Delta Delta Delta*
Phi Mu*

Fraternities:
Sigma Alpha Epsilon
Alpha Epsilon Pi
Chi Psi
Alpha Tau Omega*
Phi Kappa Sigma
Pi Kappa Alpha

Asterisks denote organizations not on my campus, which seem to be a little bit more of an accomplishment. (Though with 16 IFC fraternities you'd think I would have done a little better!)

Basically you can have any customization you want, but there are eight options manufactured - anything else would be a custom order. Everyone in my chapter has a plain badge, and I would agree that it is beautiful in its simplicity.

Sororities:
Gamma Phi Beta
Chi Omega
Phi Mu
Delta Zeta
Kappa Alpha Theta
Pi Beta Phi
Alpha Delta Pi
Alpha Omicron Pi
Alpha Gamma Delta
Alpha Xi Delta
Kappa Delta
Alpha Chi Omega
Sigma Kappa

Fraternities
Sigma Phi Epsilon
Pi Kappa Alpha
Lambda Chi Alpha
Sigma Alpha Epsilon
Phi Delta Theta
Theta Ch

Bold = Chapters on campus, both of universities.