SOURCE

var speed=50;
var d=50;
var x;
var y;
var c=0;
var h=1
function setup(){
  createCanvas(360,360);
  x=width/5;
  y=height/4;
  //colorMode(HSB,200,200,200,60);
  frameRate(5);
}
function draw(){
  background(255);
 
  noStroke();
  fill(int(random(0,255)),int(random(0,255)),int(random(0,255)));
  for(var i = 0;i<150;i++){
    x+=random(-speed,speed);
    y+=random(-speed,speed);
    x=constrain(x,1,width);
    y=constrain(y,1,height);
    triangle(x,y,x+20,y+50,x-20,y+50);
  }
  

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>