Nixie clocks are gorgeous but they cost a lot of money. They are also somewhat limited as far as customization options go. The Gixie Clock Mini is a modern take on Nixie clocks. It has a magnetic design and can be customized using an iPhone or Android device. This clock uses RGB LED tubes. It supports over 1000 colors, with 8 display modes.
This cool desktop clock has two time formats. It also has a countdown function. You can set 3 sets of alarms. The Gixie Clock Mini works with a 5V power supply.[where to get it]