I bought to SK Pang Electronics a 32 x 32 RGB LED panel:
It works great!
As usual, resources on the net to install it:
http://www.raspberrypi-spy.co.uk/2014/09/32×32-led-matrix-on-the-raspberry-pi/ [Blog that guides you to the RPi panel installation]
https://github.com/hzeller/rpi-rgb-led-matrix [Original Rpi C++ Driver]
https://github.com/ferriman/rpi-rgb-led-matrix [Fork to the original Rpi driver]
https://github.com/adafruit/RGB-matrix-Panel [Arduino driver]
https://github.com/ferriman/RGB-matrix-Panel [Fork to arduino driver]