PImage MyImage = loadImage("memorial.jpg");
size(MyImage.width, MyImage.height);
image(MyImage,0,0);
for(int x=2; x<width-2; x++) //for all rows
  for(int y=2; y<height-2; y++){ //for all columns
    color c = get(x,y);
    //make sure the values fall between 0-255
    int xx = x+int(random(-3,3));
    int yy = y+int(random(-3,3));
    set(xx,yy,c); //color the pixel
    fill(c);
    noStroke();
    rect(xx-5,yy-5,4,4);
  }