I did it! The link that Nicola found for me worked. Even though the pattern on that website is slightly different than the one I was using, the pictures helped me figure out how to fold the pieces I'd made to get them into proper slipper-ness. I'm sure there would be some interesting musings in that alone: using a pattern that's different from the one I lost to finish the work I hadn't expected to complete any more. And the value of friends who help you find your lost pattern. And having toasty toes on a rainy Sunday afternoon.
So here are my feet in their new toastiness. Top view and side view. I can report to you that those slippers are quite lovely and comfortable. Incidentally, does the word "slipper" refer to what you do to get them on your feet, or what happens to you when you wear them on a polished hardwood floor? (I did try out the latter once, when I was about eight or nine, and ended up in bed with a concussion for at least a week. I wouldn't recommend it.)
Finishing those slippers meant sewing up a million loose ends. Okay, perhaps not a million- but there are eight different squares in each, in three different colours, and each square has a beginning and end piece of yarn. You do the math. I don't like tying up loose ends. It's tedious, and somewhat messy, and not very zen-like, because you still have to pay some attention to it. You can't just zone out on it like on the stitch-click-stitch-click of the knitting itself. But it's got to be done. Actually, there is one thing I do like about it: when you're at the stage of tying up loose ends, it means you're nearly finished. That's what keeps me doing it, that inspiring feeling that the end is not only in sight, but right there squashed up against your nose. I like finishing, even if I don't like finishing- if you know what I mean.
Now, the only issue I have is that I don't actually need another pair of slippers. I've got some great moccasins which I got for Christmas last year, and which serve me quite well, thank you very much. Slippers, anyone?