function setup() {

  // https://www.colourlovers.com/palette/4834046/Lily

  colors = [

    color("#4962A2"),

    color("#E7E5BF"),

    color("#8995AF"),

    color("#6D6C4E"),

    color("#2A2A0E")

  ];

  createCanvas(600, 600);

  background(colors[0]);

  for (let i = colors.length-1; i >=0; i--) {

    let max_height = height-((i**2)*30);

    colors[i]._array[3] = map(i,colors.length-1,0,255,150)/255;

    fill(colors[i]);

    noStroke();

    // stroke(color(255,255,255,180));

    // strokeWeight(0.5);

    beginShape();

    let init_y = random(max_height-25,max_height);

    vertex(-5,init_y);

    for (let j = 0; j < width; j+=random(25)) {

      vertex(j, random(max_height-25,max_height));

    }

    vertex(width+5,random(max_height-25,max_height));

    vertex(width+5,height+5);

    vertex(-5,height+5);

    vertex(-5,init_y);

    endShape(CLOSE);

  }

}

​

function draw() {

  noLoop();

}