I think in order to make it work I have to figure out Wiring's MISO, MOSI, SCK and SS pins. I wasn't able to find Wiring schematics on the internet, so is there anyone who knows these pins, maybe Hernando?

Here is the code and documentation for the Ladies and Mens room mixup project: http://halfmachine.dk/posts/60
in there you´ll find a link with the Wiring code of the project which uses the sparkfun backpack RGB led matrix. I´ll add an example soon.
Best, H.

These 3 functions are the core of using the display (you can use any 3 Wiring pins with the display):

int bits[8] = {
  128, 64, 32, 16, 8, 4, 2, 1 };


int clock = 16;   // pin SCK del display
int data = 18;    // pin DI del display
int cs = 19;      // pin CS del display

void drawFrame(byte frame[8][8]) {
  digitalWrite(clock, LOW);  //sets the clock for each display, running through 0 then 1
  digitalWrite(data, LOW);   //ditto for data.
  delayMicroseconds(10);
  digitalWrite(cs, LOW);     //ditto for cs.
  delayMicroseconds(10);
  for(int x = 0; x < 8; x++) {
    for (int y = 0; y < 8; y++) {
     writeByte(frame[x][y]);  //Drawing the grid. x across then down to next y then x across.
     delayMicroseconds(10);
    }
  }
  delayMicroseconds(10);
  digitalWrite(cs, HIGH);
}

//prints out bytes. Each colour is printed out.
void writeByte(byte myByte) {
  for (int b = 0; b < 8; b++) { //converting it to binary from colour code.
    digitalWrite(clock, LOW);
    if ((myByte & bits[b])  > 0) {
     digitalWrite(data, HIGH);
    }
    else {
     digitalWrite(data, LOW);
    }
    digitalWrite(clock, HIGH);
    delayMicroseconds(10);
    digitalWrite(clock, LOW);
  }
}


void matrixInit() {
  pinMode(clock, OUTPUT); // sets the digital pin as output
  pinMode(data, OUTPUT);
  pinMode(cs, OUTPUT);
}