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float CELL_SIZE = 50;
int Y_OFFSET = 0;

float x;
float y;
PImage img;

void setup() {
  size(500, 500);
  background(255);

  img = loadImage("<IMAGE_FILE_PATH>");
  image(img, 0, -Y_OFFSET, img.width, img.height);
}

void draw() {
  int dstx = (int)x;
  int dsty = (int)y;
  
  int srcx = (int)x + (int)random(-CELL_SIZE, CELL_SIZE);
  int srcy = (int)y + (int)random(-CELL_SIZE, CELL_SIZE);
  
  copy(
    img,
    srcx, srcy + Y_OFFSET,
    (int)CELL_SIZE, (int)CELL_SIZE,
    dstx, dsty,
    (int)CELL_SIZE, (int)CELL_SIZE
  );

  x = x + CELL_SIZE;
  
  if (x >= width) {
    x = 0;
    y = y + CELL_SIZE;
  }
}