Haha! I feel so justified. I've been doing this for years.

I also, as a rampant sketcher and hobbyist graphic designer, got into the habit of making anything I know will be up there for some time somewhat artistic looking. The variety of styles serves as a coding system (using obvious design strategies like big and bold for important deadlines) and make it so that if anyone asks I just say it's a sort of spontaneous work of art.