David Henderson and his brothers installed their own ambilight on the back of their new TV and the end result looks awesome.

Ambilight is a technology by Philips that uses LEDs mounted on the back of their TVs to add ambient light.  David retrofitted his TV using a total of 100 addressable LEDs.  The project uses a Teensy 3.2 and takes advantage of the FastLED library.

Check out the Instructables page for details on how you can build your own.

Code for the project is also available on GitHub.