Aha. I got an email a few days ago stating that the Photoworks site was closing, and I had the option of transferring my 951 images to Shutterfly.
I couldn't imagine for the life of me how I'd gotten nearly 1000 photos onto a site without having the faintest idea what they were. So I authorized the transfer.
They're available for viewing now. Ta-da! They're the images I used to have on AOL, back when AOL had a photo division. AOL transferred them to Photoworks when their photo division closed, and I completely forgot that they'd done it.
It's good to know what the heck the photos were. :-)