Thanks for looking, geckzilla, and no, that's not it. It's a pdf file called, IIRC, spiral_galaxies.pdf (or some variation of that), and I think it's in one of the library folders. It's a 2012 calendar that has one APOD image of a spiral galaxy for each month; each month is on a separate page in the PDF. It's intended to be printed. I'd created it as the digital prize for those taking the APOD assessment survey that was held... in the late fall, I think? I'd have to check the dates, but it was that survey that ran for a week.