I graduated in 2009 and I have three sets of greek letters (I hold membership in 3 orgs) in my rear window. I think having stickers in your car window is a simple way to showcase lifetime membership (though, personally, I would advocate for membership in an alumnae chapter)!
Carstickers.com has a great greek selection! And, you can also customize it to put the word "Alumna" under the greek letters. If I ever needed new car stickers, I would order one from carstickers.
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♫ ΣAI
♥ ΑΓΔ
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