55 inch 4K TV to use as my computer screen. I can sit further away (I'm pretty sure it's less eye strain for the screen to be further away), fit more windows comfortably (great for dev work), and when I'm done with work I can sit back further on the couch and watch anime and movies with my wife.

Addressable (programmable) LED strip - you can use an Arduino or Raspberry Pi to play with it - going to have fun playing with it.