Update: My littleBits sample rotator was featured on Dangerous Prototypes!
littleBits are color coded electronic modules that connect together magnetically to create simple electronic circuits. They are designed for ages 8 and up so hobbyists, designers, makers, and artists can add light, sound, and motion to their crafts and projects. Since they connect up magnetically (no need for circuit boards, breadboards, or solder), you can’t accidentally connect them the wrong way. With littleBits you can quickly build electronic circuits in a matter of minutes.
The color coded modules are divided into four categories. Blue, for power, currently includes three modules—the power module to which you connect a 9 volt battery, a coin battery module, and a USB power module. Pink for “input,” currently includes almost two dozen modules such as push buttons, switches, potentiometers, light sensors, and so on. Orange, for “wire,” includes several wires, branching connectors, and logic gates. Finally, the green “output” components include a little over a dozen modules such as motors, a fan, a buzzer, several kinds of LEDs, and a speaker.
An example of a circuit might be the blue power module connected to a green motor module. Switch on the power switch located on the power module and the motor spins. (2)
(1) Source: http://www.teklalabs.org/sample-rotator