This project is a Nixie Clock using 4 tubes and common components. This clock is designed to be easy-to-build and it’s build using two boards one over the other. Clock works at voltages from 7.5V to about 14V and consumes around 200mA. The shield board has 4 RGB LEDs under the Nixies that can be turned off if you don’t like how it looks. It shows time, full date and temperature.
Nixie Clock with 4 tubes - [Link]