Here is a Concept Pen by a Korean Designer by the name of Jinsu Park which I know will wow alot of readers. It is a color picker pen which brings the eyedropper to real life. The pen has a scanner that scans an objects to detect the color and then the user can use the detected color to write or draw.
After detecting a color the pen then generates the color detected with its RGB ink cartridge inside the pen. The ink is mix just as a ink jet printer would to create the detected color. This is still a concept so there is no price or availability information just yet. More photos of the Color Picker Pen Concept after the jump