CloneBrush

CloneBrush allows you to paint with strokes made out of the scenery you see around you. Just aim the camera at part of something you see, then slowly move your aim to another part of what you see, taking any path. The stroke of scenery you follow will be simultaneously spray painted onto a digital canvas.

This is a functional prototype (real example paintings above).

Quartz Composer, OpenCV, Handycam