Loving this thread! My school didn't use letters like this, we were totally missing out.
It's really interesting seeing how different groups tackle letters, like the Xi issue! My favorite so far: The purple ΣΣΣ with green flowers, the XΩ owl- that is so cute! (but makes me feel like the X needs something extra), and the black & white ΠBΦ. I also like the Delta Zeta ones for their simplicity & having the Delta Zeta written out in the scrolly lettering on each.
DubaiSis... do you think you could add a line break between your pictures to make the page width go back to normal?