So you are looking for a clock that turns heads? This Darth Vader Nixie Tube Clock is well worth a look. It has 4 x IN-17 nixie tubes inside an ABS thermoplastic body. This clock runs on 350-500mAh battery. It has 3 buttons that let you change brightness and RGB lighting modes.
This clock can be charged with a regular USB charger or 5V power supply. The bad news? Something like this doesn’t come cheap.