SOURCE

let c=[];
function setup(){
    createCanvas(600,600);
    noStroke();
    background(220);
     for(let i=0;i<540;i++){
         c[i]=random(255); 
    }
}
function draw(){
    for(let i=0;i<540;i++){    
        let index=i*3;
        fill(c[index],c[index+1],c[index+2]);
        ellipse(i*54,280,32,height);
    }
}

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