I bet you like Nixie clocks and probably wouldn’t mind to have one on your table. Anyway, Nixie displays require relatively high voltage to light segments. But if you don’t want to generate higher voltages but rather stay with 5V then you should consider numitron displays. These vacuum tube displays light up from like 5V. Pinomelean purchased several of IV-9 displays and wanted to build very simple digital clock.
Instead of making full number display he used single digit to tell time. The method is pretty simple – it displays hours and minutes one by one. Four additional LEDs allow easy tracking of current digit displayed. Clock is driven by PIC16F84A microcontroller which is clocked at 4MHz. Using one digit display saves space and allows to design small device. For basic time monitoring this is more than enough.