Wow!! Thanks for all the compliments and suggestions! After reading your comments and looking at my wrist warmer some more, I have decided that I like it the way that it is, but it could be so much more. So I'm definitely going to extend the top to (or over) my knuckles. And I think I'm going to add a decorative edge and maybe a thumb to it, too (I originally wanted to add a thumb, but I wasn't quite sure how to do it). Thanks so much, Rain_, for the directions on how to do a picot cast on and cast off! I might also experiment with substituting something different for the middle cable. I agree that the braid one is a bit wide for my skinny-minny wrists.
Welp, I'm off to go knit some swatches. Thanks again. You are all fantastic!