let color=[];
let x=[];
function setup(){
createCanvas(600,600);
rectMode(CENTER);
background(255);
noStroke();
for(let i=0;i<9;i++){
color[i]=random(255);
}
for(let i=0;i<3;i++){
x[i]=random(100,100);
}
for(let i=0;i<3;i++){
let index=i*3;
fill(color[index],color[index+1],color[index+2]);
rect(random(width),random(height),x[i],x[i]);
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>