Nixie tube clock kits ($150) – check out the PDF to get an idea of what you’re in for – “This kit uses a microcontroller and discrete logic chips to provide the logic for a 12 hour clock based on IN-14 nixie tubes. It has hours, minutes and seconds, with colon separators. The kit is able to be programmed as a 12 or 24 hour clock, although the alarm function will not work fully for the 24 hour clock. The kit has additional features compared to the old kit, including an alarm, with snooze button, that can play any tune you desire, or make almost any sound (it uses a Picaxe 08M microcontroller to do this), two-level adjustable nixie brightness, separate 10-level colon brightness (and you can have either real neon or LED colons), LED tube uplighting with adjustable brightness (blue LEDs are supplied, not green as in the pic), am/pm indicator, and the option to have the display triggered by a small passive infrared detector module, so that the tubes are only lit when someone is within reading range of the clock… “ – Link.
Related: More Nixie – Link.