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!
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CSS

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HTML 

              
                <canvas></canvas>
<h1>404</h1>
<section>
  <span>I'm lost... Take me home!</span>
</section>
!

CSS 

              
                body {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  display: grid;
  place-content: center;
  background: #fff;
}
canvas {
  position: absolute;
  top: 0;
  left: 0;
  // z-index: 1;
}

h1 {
  font-size: 500px;
  color: #fff;
  position: relative;
  pointer-events: none;
  margin: 80px 0 0;
  padding: 0;
  // z-index: 2;
}
section {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: grid;
  place-content: center;
  pointer-events: none;
}
span {
  display: inline-block;
  padding: 20px 60px;
  font-family: serif;
  background: #e1e444;
  color: #000;
  pointer-events: all;
  cursor: pointer;
  border-radius: 55px;
  font-size: 24px;
  letter-spacing: 1px;
  transition: color 0.2s, background 0.2s;

  &:hover {
    background: #000;
    color: #fff;
  }
  // transform: translate(-50% -50%);
}
!

JS 

              
                const canvas = document.querySelector("canvas");
const canvasImages = [];

canvas.width = innerWidth;
canvas.height = innerHeight;
const ctx = canvas.getContext("2d");

const feather1 =
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const images = [
  "https://images.ctfassets.net/beeay9aupl8z/3kS8zCAqAaViBuakHdni1D/0aecd7a6a83e4732f3e2275c29bbedf5/bird3.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/SrzRQTz94ucUUXSRQw57n/d389f72fa0695d30b3b8c9f22278c7e0/beach.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/73bT2TBQiUOtaQYdJLQgMt/50c131ed50ad2a9e56c3bc7044bf97a1/boarder.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/7xXaESXat6mBfjFQAzamrv/2f43ef3ed50c3085ab393b1b8f29f1cc/bird2.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/36xnMMfdPZiymYMnYJMjNf/4d682fdd5ed8ca5ed89361b1d195799b/bird1.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/7t142CYF9wLFONxLLWmDdV/b14dd5c3afb71ea13a5489589510c13e/bird4.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/1W4sU23GGrTlBYIBctEH0j/bf37019afc031222a1117aa19945c325/BirdLoop.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80",
  "https://images.ctfassets.net/beeay9aupl8z/44rtppWgqZs9SOYgW3JCdx/e0707dd82de704b073da5883047da9db/birddock.jpg?w=736&h=736&fm=jpg&fl=progressive&q=80"
];

let p = new Path2D(feather1);

images.forEach((image) => {
  const canvasImage = new Image();
  canvasImage.src = image;
  canvasImages.push(canvasImage);
});

let prevX = 0;
let prevY = 0;
let prevRotation = 0;

const setDraw = (e) => {
  draw(e.clientX, e.clientY);
  prevX = e.clientX;
  prevY = e.clientY;
};

const placeImage = (ctx, f, rotation, scale) => {
  ctx.save(); // Save the context before clipping
  ctx.clip(f); // Clip to whatever path is on the context
  ctx.rotate(-rotation);
  ctx.drawImage(
    gsap.utils.random(canvasImages),
    (-736 / 2) * scale,
    (-736 / 2) * scale,
    736 * scale,
    736 * scale
  );

  ctx.restore(); // Get rid of the clipping region
};

let black = false;

const draw = (x, y) => {
  let f = new Path2D();
  const scale = gsap.utils.random(0.1, 0.7, 0.1);
  const rotation = gsap.utils.random(0, 6.2832);
  const matrix = {
    a: scale,
    b: 0,
    c: 0,
    d: scale,
    e: (scale * -736) / 2,
    f: (scale * -218) / 2
  };
  f.addPath(p, matrix);
  ctx.rotate(-prevRotation);
  ctx.translate(x - prevX, y - prevY);

  // var pat = ctx.createPattern(image, "repeat");
  ctx.rotate(rotation);
  if (black) {
    ctx.fill(f);
    black = false;
  } else {
    placeImage(ctx, f, rotation, scale);
    black = true;
  }
  prevRotation = rotation;
  ctx.restore();
};

// var throttleFn =  _.throttle(, 100);
// canvas.addEventListener("click", setDraw, false);
canvas.addEventListener("mousemove", _.throttle(setDraw, 100), false);
!
999px

Console