A option would be to turn it into an OBD2 monitor for your car. It's fun to look at, and useful for logging data and tracking usage.
Another use would be to share your location using Google Maps. You can take it a step further using Automate or Tasker, and implement something that asks you to verify if you're okay every hour or so, rings your phone if you forgot to verify, and then sends a text/location to your closest family members.
Or, use it for home/computer automation. I currently have my phone set to turn on my PC whenever I reach home (detect WiFi network, send a WoL packet). If you're rooted, you can probably also use the fingerprint sensor to unlock your computer. Gimmicky, but convenient i guess.
If it has an IR Blaster, turn it into a TV/AC remote for your house.
If you take medication, you can have it notify and keep a count.
If you're getting into your car after a fixed time (say, after work shift is over), text people that you're going home, or do anything related to home automation if you have that set up.
Those are few of my ideas. I'd suggest googling for "What do you use [Tasker/Automate] for in [year]?"