Lots of things can be displayed on a 7 segment display. Originally our model was built for an "8 bit bar" where we piled up a lot of old TVs and hardware as the "backdrop" for a bar at a student party.
The project uses an Arduino Nano, a MAX7219 and eight big 7 segment modules. To control the MAX7219, we use Arduino's official LedControl library.
git submodule init
git submodule update
cd arduino
make upload