You know, I think I have every CD of theirs, and the radio show CDs, but the only thing I can think of that I printed was the Miskatonic Library Book Kit. Their work is excellent and I love it, but ... I dunno.
I did just think about making an Esoteric Order of Dagon card, because the H P Podcraft guys are covering it.
I was inspired by the HPLHS' membership card to make my own Starry Wisdom card