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A 2D array would be passed as const byte *frames[8]. However you really don't need the complexity of a 2D array - you can do it with a 1D array.

Your array would look like:

const byte SPACED_STRIPES[] = {
     0b11000110,
     0b10001100,
     0b00011000,
     0b00110001,
     0b01100011,
     0b11000110,
     0b10001100,
     0b00011000,

     0b01100011,
     0b11000110,
     0b10001100,
     0b00011000,
     0b00110001,
     0b01100011,
     0b11000110,
     0b10001100,
...    
};

And you reference frames within it as a multiple of 8 of the index. Using your existing code it would look like:

void CSMatrix::runTwoColorPattern(const byte *frames, const int length, int delayDuration)
{
  for (uint8_t i = 0; i < length; i++)
  {
    renderFrame(&frames[i * 8]); // Take the address of the first value of the frame at a multiple of 8
    FastLED.show();
    delay(delayDuration);
  }
}