I'm making a 64 RGB led board, specifically for chess but hopefully for some other functions as well. For those of you who have used the TLC5940, is it possible to cycle through 192 LEDs without flicker? From where I stand with the 5940s so far, you set the PWM rate, and then it keeps going until you need to change it? I'll keep digging and probably edit/post later.
from what i know, yes you can do, but you need 12 of them, which will cost you 80-100 dollar just for the drivers.
i would go for the rainbowduino instead. 20 dollar and can do what you need.
there are quite a lot of 8*8 RGB LED projects. The rainbowduino seems to be a good choice for that. it does not have any other input or output besides for the LED, but you can hook up anther arduino via i2c bus.