Meet the Flux Condenser: a cool PCB badge with animated LEDs that makes a nice gift for Back to the Future fans. It is driven by a ATtiny816 microcontroller and uses a CR2032/LIR2032 coin cell battery. This PCB badge has 24 LEDs, measuring 35 x 25mm.
The Flux Condenser comes with 2 animation modes. It also has 4 brightness levels. You can find out more about it here.