I made this 8x8 matrix for a friend who needed iflag.
The case is made to use with an arduino nano, it fits perfectly into the clips.
I used a USB-C connector that I soldered in place of the Arduino connector.
Parts used:
8x8 led panel WS2812B | Aliexpress | Amazon
Arduino Nano without weld pin| Aliexpress | Amazon
USB-C connector | Aliexpress