Here is another cool gift idea for Nixie fans. The Millclock IN-14 Nixie Clock has 6 tubes and a wood enclosure. It can display the time in 12/24 hour format. It has plenty of color and brightness combinations for you to choose from.
The digits have adjustable RGB colors but you can also change the speed at which they change. The Millclock IN-14 Nixie Tube Clock has a built-in battery backup feature to keep time in case of a power outage.