I got myself a Totoro calendar for Christmas and I've been having some fun doing some little sketches in it. There's some Studio Ghibli sketches in it along with some of my own doodles and watercolor manga.
It's funny how my day planners and calendars become the best sketchbooks that I have. I think this happens because there's no pressure to make a 'good' sketch in them; it's all about fun. The more fun you have while you draw, the better your drawings will be.