Python software to scroll messages on an 8x32 WS2812 matrix controlled by a Raspberry Pi Zero W
This software was used to display messages on a flexible panel attached with hook-and-loop fasteners to a t-shirt, worn underneath a top shirt. The Pi Zero W can be carried in a pocket, powered by batteries (important: allow for sufficient current for the LED panel!). The Pi GPIO 18 pin is used to send data to the WS2812 matrix.
Lots of room for embelishment: wifi/bluetooth control from a cellphone, automatic displays of tweets, and so forth. And of course, more colour!