I just ordered some of these 8 x 8 LED Matrix panels to use for my LEDTriks setup. They may be a little small but I was thinking of attempting to make a 2 x 2 setup of them and use 4 LEDTriks boards. Each panel is 2.37" square. It would give a size of 4.74" x 14.22" for one LEDTriks panel. I got a response from the seller and he said the LED's were 2200mcd.
Here is the ebay link.
The panels have a lower current rating then what RJ has designed the LEDTriks board for so the resistor value will have to be changed in order to use them.