Scott Wade lives on an un-paved road in San Marcos, TX, so the back of his Mini Cooper is always ready for him. In addition to his fingers, Wade also uses more traditional tools like brushes as well as unconventional ones like popsicle sticks to create his inspired dust art.
I have no idea if this is the original source, so I’ll just provide a link to more details and call it a day.
dirtycarart.com