Check out Jon’s Nixie propeller clock – “I was inspired to build this clock after I saw some links to see “Nebulus, the world’s first nixie propeller clock.” Unfortunately, by that time many of the links were dead and I only managed to find a video of the clock. I never could find any documentation or schematics for the clock, but I assumed it probably used a microcontroller and some high voltage chips or transistors. I happened to find some pictures of it buried in the Yahoo group Neonixie-L files after I built my nixie propeller clock.”Link. There are a *ton* of other projects here too