I recently visited San Francisco, stopped by Noisebridge, and left a message on their scrolling LED display:
Some interesting previous messages there:
- Bush Did The Moon Landing
- h4k m3 plz
- Welcome to noisebridge! We love you.
- gibe moni plos
- Donations & Chill?
- Noisebridge: Now Web Scale!
They like RGB LED pixels too – an interesting setup with crates and clear glass bottles. First image grabbed from their project page which also has a bunch of documentation:
Some photos of the back, showing the wiring: