Numitron Clock
Scratch-built with Numitron tubes, which resemble Nixies but are actually low-voltage incandescent 7-segement displays wirth a nice, warm glow. Time, date and temperature.
PIC 16F690, DS3231 RTC, and an old-time driver chip, SAA1064, of which I think I bought the last dozen for sale on the planet, just in time to build this clock. The red wire is a green wire correction.