But what is this for!
Well, here's a spoiler. I just got it working.
I'm calling it Arduquee, an Arduino powered Marquee. The boards fit together to create a marquee of any length, and the first board will be the 'controller' with a Atmega 328. Has three colors, Red, green and orange (red plus green) and only requires 6 I/O pins. The controller will also have a 5V 2A voltage regulator to power it as well. The PCB was designed so that it could be a controller or slave, just depends what you populate it with.
If there's enough interest, I'm thinking of open-sourcing the design and selling kits.
Proper post coming in a few weeks when I really get it going.