A couple of years ago, a group of entrepreneurs successfully Kickstarted a little something known as the Chameleon Pen. In a nutshell, it's an art pen that changes color tone as you draw – for example ...

Colored, special effect inks, used in permanent markers, printers, or other dispensers, have a very attractive appearance and are extremely popular for lettering and drawing on non-porous materials.

If you want to sample a color that you encounter in the real world and then reproduce it on your computer, you might already be interested in devices like the SwatchMate Cube or the NODE Chroma module ...