Okay. I know that this is the knitting equivalent of walking into a bookstore and saying "I'm looking for a book? It has a blue cover? Or maybe green?" But I have been searching Ravelry and am at wit's end.
So at some point I saw a pattern for armwarmers. I did not save it, because they were long and I was like pfft, I am not going to want to knit a gazillion stitches. Which was not smart of me, because now I have a project it'd be perfect for, and I cannot find it.
So: Armwarmers/fingerless mitts/sleeves. Opera-glove length. I think in the picture they were black. And they had a sinuous lace pattern of yarnovers all the way down, looking all manner of serpentine.
WHY DO I NOT HAVE A KNITTING ICON I don't know.
Edit: Definitely knitting, not crochet. And lace pattern with yarnovers. If there are no yarnovers in the pattern, it is definitely not that pattern.