I often doodle while on the phone. I spent a bit of time talking to my parents today and decided to sketch out a little Medusa while doing so. It's only about 4"x4", but it was big enough to get some nice detail in. I was reading a book by artist John Howe and he had a small illustration he did that inspired me. I love doing these little sketches, and have a whole collection of them in a folder in my office.
I may do a review of the John Howe book later on. It's one in a series of fantastic books on his drawing style and techniques.