Miranda scarf is finished!
Here are the pictures:

The two ends:

The middle:

No, I don't have any pictures showing the whole thing, because this thing is long.

Project specifications
Needles: INOX 3.00mm circular
Yarn: Zephyr Wool-Silk in Ebony. I bought two 2-oz balls, and for some reason I used some but not all of both of them. So this thing took between 2 and 4 ounces.
Finished dimensions: Width about 35 cm; length about 170 cm.
Pattern: My own. The middle is "Spider Stitch" and "Wings of the Swan" from The Craft of Lace Knitting; the ends are a combination of Elaborated Print O' the Wave from Heirloom Knitting and some things that I thought would look good. The edging is the one on the Legends of the Shetland Seas shawl, with purl rows added (so it's about half as pointy).

Things I would do differently next time: I did a plain, simple center and two complicated ends. For some reason, I knit the center first. Next time, I will knit the first border first, then the center, then the second border. This is because six stitches more or less would make a big difference in the center (I wish I had had six more stitches), whereas the center I could have added or subtracted a couple of spider repeats without changing anything.

I sort of wish I had just left out the Wings of the Swan and done the center in plain, simple spider stitch. I also wish I'd chosen a different edging: I think that just a zigzag lace trellis would perhaps be better than the thing with three holes that I went with.