Don't mind sharing at all! I use an old version of Macromedia Flash. Prior to that I draw it up in pencil, then use Flash to create the different layers of color. Most people I know use photoshop. I however became familiar with Flash as I used to do animated cartoons for awhile and Flash was the easiest program to use at the time. Eventually this piece will end up being a multi layered stenciled piece on canvas. It's on my to do list in the next couple months!