Adafruit customer Kris Applegate posted this great demo video of how he used an Arduino Mega, and Adafruit Digital Addressable LED Light Strips to make his Dell trade show booth more interactive. Using a Dell touchscreen PC, the customer can select a product, and the LED light strips will highlight that product in one of the server racks.
These LED strips are fun and glowy. There are 32 RGB LEDs per meter, and you can control each LED individually! Yes, that’s right, this is the digitally-addressable type of LED strip. You can set the color of each LED’s red, green and blue component with 7-bit PWM precision (so 21-bit color per pixel). The LEDs are controlled by shift-registers that are chained up down the strip so you can shorten or lengthen the strip. Only 2 digital output pins are required to send data down. The PWM is built into each chip so once you set the color you can stop talking to the strip and it will continue to PWM all the LEDs for you.