Have a pair of favorite socks that you just can’t part with, but that have a hole in them???  Mine had a hole in the heel… but the rest of the sock was still in great shape.  So, I cut the feet off :

Then, I simply serged the raw edge – and now I have a nice set of wrist warmers!

I like the serged edge, but one could also use a seam binding or even a contrast yarn and stitch or crochet and edging on them.  Maybe even make some to poke out of the top of  your boots!