I thought I would share this little project I was working on over the weekend, if you watch a lot of movies etc like me then you might like this.
What it does (not my video)
It's pretty easy to accomplish with 16.4ft (5m) of ws2812 LED's (if you got a bigger tv then you might need more then 5 meter of led strip) and raspberry pi, I don't know about other boxes but I know it's working nicely on RPi3.
Tutorials:
You can find many more tutorials just by using Google and keywords like Hyperion + ws2812 led + ambilight etc....