Random sin waves

int x=0,y=50;

void setup(){
size(800,500);
background(255);
frameRate(10);
smooth();
}

void draw(){
background(0);
draw_snow();

}

void draw_snow()
{
 int i,size=4;
  for (i=0;i<width;i+=size){
    y=y+int(random(-10,10));
    size=int(random(2,5));
    ellipse(x+i,y,size,size);
  }
  fill(random(255),random(100,255),0);
   x=int(random(x-size/4,x+size/4)); //wiggle
   y=(y+10)%height;
}