I recently stumbled across Shanghai-based designer Chris Hosmer's remarkable tape drawings. I love the expressiveness and fluidity he achieves with the mundane "medium" of electrical tape.
Hosmer describes how he was inspired while working on a GM Saturn design team, when a veteran car designer "drew" an entire car profile out of tape before his very eyes. The process, he says, is very physical and is more controlled than a whiteboard, but also feels like you're running your hands along the profile of a real car.
Here's a stop-motion video of a mural Hosmer did:
Hashidate Stop Motion from Chris Hosmer on Vimeo.