DIY Coffe Cup Cozy
Cut the top half off of the socks (I found this sweet pair at Daiso, a cute little Japanese discount store near me). You'll be left with a tube that has openings on both ends and the bottom half of a sock (which you can still use to keep your toes warm).
Slide the top half of the sock over your ceramic mug and enjoy your beverage without burning your fingers.
It also works on paper to-go cups, so store it in your bag when you're headed to Starbucks, or Coffee Bean, or wherever you get your fix.