The thing I like most about drones is that they lend themselves really well to DIY and hobby stuff. As such, I’ve found this project from the super-helpful Oscar Liang.
The thing I like about this is I can, for a small investment, just swap around what I have, or just buy some spare parts from my local shop (which, let’s be honest, I’m going to need eventually anyway) and have a second kit ready to fly. It works with my TX (mostly) and can just be a cool second drone to fly around.