This sketch hides messages in images of static.

Static-Cipher.pde

void setup() {
  size(600,600);
  int step = 2;
  int imgx = 0;
  int imgy = 0;
  int rand = 0;
  PImage Poltergeist = loadImage("Poltergeist.png");
  PImage Img = createImage(width,height,ARGB);
  Poltergeist.loadPixels();
  for (int x = 0; x<width;x++) {
    for (int y = 0; y <height/step; y++) {
      int loc = x + y*width;
      rand = int(random(0,255));
      int imgloc = imgx + imgy * width;
      Img.pixels[imgloc] = color(rand);
      imgy = imgy + step;
    }
    imgy = 0;
    imgx = imgx + 1;
  }
  print(str(imgx));
  for (int x = 0; x <width; x++) {
    for (int y = 0; y < height/step; y++) {
      int loc = x+y*width;
      float r = red(Poltergeist.pixels[loc]);
      float g = green(Poltergeist.pixels[loc]);
      float b = blue(Poltergeist.pixels[loc]);
      if ((r==255) && (g==255) && (b==255)) { 
        //Randomize the r, g, b values
        rand = int(random(0,255));
        r = rand;
        g = rand;
        b = rand;
      }
      int imgloc = imgx + imgy * width;
      Img.pixels[imgloc] = color(r,g,b);
      imgy = imgy + step;
    }
    imgy = 0;
    imgx = imgx + 1;
  }
Img.updatePixels();
image(Img, 0,0);
save("Message.png");
}

void draw() {
}