For my best friend's 50th birthday a couple years ago, I decided to make him a Clock/Radio/Sound effects that looks something like the time circuit display in Back to the Future, since he's a huge fan of those movies. Here is a snapshot of where it is today. I've been adding new functionality to it and fixing things on it every year since.
I2C Input mux for the keypad
Adafruit SoundFX board
Cheap power supply board for 5v/4A supply off Aliexpress
Sparkfun level shifter boards
For the MAX7219s. The ICM7228s didn't need them.