I/O Brush : A Fresh Look at Painting
Have you ever heard of I/O brush? Well, here it is :

It looks like an ordinary brush, right? Well, not actually. It’s a special tool, developed by K. Ryokai at MIT University, that allows the user to sample colours, textures and effects from the real world, and transfer them to screen.
When I first read this description, I found it hard to understand the metaphor. How can you “transfer” a real texture to the screen? And then I downloaded and saw - flabbergasted - the explanatory video. I suggest you download it and view it too, it’s guaranteed satisfaction and instant “Ooooooh. Now that’s what it is!”.
More info can also be found at the two articles that the makers of the I/O brush published, “Designing the World as Your Palette” and “I/O Brush: Drawing with Everyday Objects as Ink“.
Truth is, I don’t know exactly how practical this could be. But it’s one of the most innovative gadgets I’ve seen in a long while. Full credits to its creators!