I found an awesome idea for the geeky warm beverage enthusiast: Geeky Mug Cozies, by Cuddlefish Crafts. (Note: only some of her cozies are geeky).
While Cuddlefish has not provided a pattern for sale here, an enterprising (ba-dum) person can probably figure out how to make one of these. Or, you can do a Google search for “Crochet coffee cozy” and find a list of tutorials on how to make these (including a YouTube video or three). From there it’s just making little embellishments to geek them out.
-Confusion is a state of mind, or is it?