Cuppow has just put up a great list of available jar cozies, including ideas using free/recycled stuff probably already in your house. There is also a drawing to win a bunch of fun items, so click on over and enter.
And while I do not need another cozy,
I think this one from BNG Tacticool Survival may need to be added to the household emergency kit. The cozy can be unwound to provide paracord, just in case. Not just for jars, it works just as well on beer cans. Chances are you have a couple people on your holiday list who would love one too.