Software apps and online services
I spotted one of these 8x32 LED Matrix displays and thought it would make a cool "news ticker." It turns out there is already a great library for driving the MAX7219. Couple this with Particle webhooks and the Blynk library, and it takes less than an hour to make a real-time scrolling ticker controlled by a smartphone app. I configured the ticker to selectively display text messages sent via the Blynk app or real-time weather (METAR).
More on Particle webhooks:
Background on the MAX7219 and the existing Particle library: