Organic molecules color the world around us. Grass is green, carrots are orange, and blue jeans are blue because of the electronic properties of organic dye molecules. But such molecules can do more than simply provide color. Thin films of organic molecules can be made more electrically conductive by shining light on them (photoconductivity). They can be cycled between colored and transparent using an electric field (electrochromism) or UV light (photochromism). When sandwiched between electrodes, they can emit visible light (electroluminescence). The current flowing through them can be modulated by an electric field. Hence, in recent years the electrical and optical properties of organic molecules have been exploited in technologies like xerography, solar cells, smart windows, and photochromic eyeglass lenses. Organic LED displays are already commercially available in cell phones, digital cameras, car stereos, and other consumer products. Organic transistors are being pursued for display backplanes, radio frequency identification tags, smart cards, and a variety of sensors. Organic thin films are easily deposited over large areas and onto flexible plastic substrates, opening the door for products such as electronic paper or even wallpaper. The mechanical flexibility of organic devices allows them to be embedded as sensors in robotic skin, for example. OLEDs and organic photovoltaic devices are also being integrated into microfluidic platforms for lab-on-a-chip applications. In these and other application areas, organic electronic and photonic devices are poised to become as commonplace as silicon in our everyday lives.