I've finished up this pair.
At the lower edge I tried out the kind of purl braid where you alternate colors twisting the yarns every stitch as you go. I did two rounds on each edge, with the twist going in the same direction on each. It might have been prettier if I had changed direction on the second round, but the maneuver was new and awkward enough to my fingers and brain that I didn't. It isn't really all that difficult, just a little fiddly, and you have to untwist the working yarns at the end (though if I had changed direction they would have untwisted during the course of the second round).
As you can see, on the thumbs I didn't try to exactly match the underlying palm pattern.