// simple snow with saturation/brightness adjustment
int x,y;
void setup(){
  size(320,240);
}

void draw(){
  loadPixels();
  for(int i=0; i<width*height; i++){
    x = mouseX;
    y = mouseY;
    if(x < y){
      pixels[i] = color(int(random(x,y)));
    } else {
      pixels[i] = color(int(random(y,x)));
    }
  }
  updatePixels();
}