I suggest look at ebay for "0832" LED panels... If you see what I think you will, SPI-like-panels, and a 16f723 control board, I have mountains of code for you... If you'r interested in more power from the board (more characters, effects, graphics, colors etc) it is easy to control them with any PIC, I've got veroboard based 16f88's (384bytes ram!!!) running some, and have also had a "pic24 and wifi module" demoboard running them too... We're about to have wifi-webpage controllable LED panels when I get on top of the "stack" code...
Look at my other threads, videos etc, I'm happy to help
Regards
NEAL