Vi Hart, who presents herself as a Mathemusician on YouTube does some awsome droodling. Once you catch up with the tempo of her talking and drawing, the lesson is simple and fascinating. You can droodle more focussed and you'll probably get quite into dicovering the laws Vi Hart lays out...
I know how I'm gonna spend my next boardmeeting.

Oh boy... She has some more breathtaking droodle principals to share with us... Watch also Stars!