let speed=300;
let a=350;
let b=350;
let speed2=100;
function setup(){
createCanvas(500,500);
background(255,230,100);
}
function draw(){
translate(a+random(-speed,speed2),b+random(-speed,speed2));
rotate(random(-speed2,speed2));
rect(0,0,50,50);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>