Some may not find this cool or amazing, but I constructed this backlight for my TV. It uses a Raspberry Pi with hyperion loaded, along with a HDMI splitter (2 in my case) and a capture card. The Pi looks at the hdmi feed, grabs the edges and sends it to a addressable LED strip.

Special thanks to Izzy for making this possible.

And please ignore the fact that my TV decided to torch a backlight LED the day I finally hung it on the wall. Parts on the way.