Nixie Time is a simple, but awesome looking clock app for Apple TV.
If you haven't heard of them, Nixie tubes are glass vacuum tubes that contain a wire-mesh anode and multiple cathodes, shaped like numerals or other symbols. Applying power to one cathode surrounds it with an orange glow discharge. Nixie Time simulates a clock made up of these tubes.
Nixie Time supports regular and 24 hour time formats, and you can choose to show a leading zero on the hour if you like.
If you like the app and would like to see any additional features added, feel free to contact me!