function setup(){
createCanvas(600,600);
background(285);
noStroke(100);
}
function draw(){
for(let y=50;y<=height;y+=100){
for(let x=50;x<=width;x+=100){
fill(260,210,600);
ellipse(x,y,90)
}
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>