Found it!

Look, look, I found my mojo! Turns out it was hiding in my Ravelry queue.

Pattern - Calorimetry
Yarn - Colinette Prism, 56 yards
Mods - Cast on 96 stitches instead of 104, knit fewer repeats to make it smaller.
Finished size - ever-so-slightly too big, but it'll be good once my hair grows back out.

Only took about 6 hours of knitting time, total. I'm delighted with it. The perfect antidote to long-term project doldrums. You can't really see them, but I ended up making knot buttons with leftover yarn. Would you believe it, I did not have a single red button in my button box!

I've also finished a Christmas present for my beloved enabling grandmother, but that'll be revealed after she opens it on the day. :)