In the past few years, we have covered plenty of neat Nixie tube gadgets here. This IN-14 Steampunk Nixie Clock is also worth a look. It has an Eimac VT 129/304 TL high power transmitter tube, 3 RGBs in the base, and one behind. It has a 6-digit display and battery backup to keep time.
This steampunk Nixie clock measures 9 inches wide by 6 inches deep and 16 inches tall. It has cooper and brass elements. You can find it on eBay.