This pingpong wall clock would light up any wall! Via Hackster.io:
Makers have long known that ping pong balls make great diffusers for LEDs, but now, using individual RGB LED PCBs, Tjjensma has taken things to a whole new level and created ping pong ball clock. This device, which uses an Arduino Nano clone and an RTC module for accurate timekeeping, involved daisy-chaining well over 100 LED modules together to form the display.
The clock itself — meant to hang on a wall — looks like a sort of stretched-out hexagon, with sloping side pieces and a long middle to display hours and minutes, along with a colon to separate everything. Woodworking involved is simple, though effective. Wiring seems fairly straightforward, but actually soldering all the LEDs together had to be quite a bit of work
You can see a video of the clock in action on reddit
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.