One of my favorite things to do on a lazy day is to just sketch while watching a movie or tv series.
The key animation on Korra is fantastic, so much so that I even ordered the blu ray so I'll be able to frame by frame it (also to support a product I love).
I also want to recommend a new podcast I've been listening to called TOONTALK! It's very similar to the "Animation Podcast", but that podcast has run a bit dry unfortunately. I would recommend you start with the interview with Jason Ryan. There is a ton of great information and some general tips about managing your time for personal projects.