Yeah, that's a hot water bottle, fo' sho'. I gathered a bunch of scrap yarn and knit the cover based on the stitches calculated for this pattern. I made the fair isle design up on the fly, and I'm pretty pleased with it. This winter, I've also been trying to convert all my friends to using hot water bottles (for cramps, warming cold beds, snuggling with, etc.). I draw the line at tea pot cozies...at least for now.
Anyway, it's been a wonderful Christmas filled with terrariums, librarian-themed clothing, and anime cartoon series from the past.