Anybody that has had the pleasure of working with me will know that during meetings, I doodle. When things are going well, I produce complete drawings, when I'm feeling a bit stressed, it's abstract repeating patterns, and when I'm entirely disinterested, it's calculated and structured patterns, which I re-work over a number of iterations. All but the last mode of doodle help me focus (read this). If I've entered the last mode of doodle, you've lost me and maybe Powerpoint isn't the right way to win over a room for you.
Calling this stuff artwork is a bit of a stretch, but that don't bother me none. These drawings were produced pre-2011, I have a stack of new material that I will one day get around to digitizing.