We have covered a bunch of awesome Nixie Tube clocks here in the past. Want something wearable? Moonracer by Millclock is worth a look. It is a steampunk Nixie watch made of a single solid piece of aluminum. It shows time in 24 or 12hr format.
This Nixie watch runs on battery for 10 hours. It is easy to set up with 2 keys. You can also set the duration of the display from 0 to 15 points. Expected to ship in December.