A Line of Code "Scribble" Canvas Animation

"Scribble" canvas animation for my experimental code site http://alineofcode.com

HTML

<canvas id="canvas" width="70" height="70">
    <img src="http://i.imgur.com/NvPmS0T.jpg" />
</canvas>

CSS

canvas {border:0px solid #ccc;}

JavaScript

// requestAnimationFrame Shim
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());

// Les Variables.
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var fps = 15;

// Initialize All The Things!
function init() {
    draw();
}

// Draw on our canvas.
function draw() {
    
    // To Set A Framerate Using requestAnimationFrame
    setTimeout(function() {
        ctx.clearRect(0,0,400,300);
        requestAnimationFrame(draw);
        ctx.beginPath();
        ctx.moveTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() * 70, Math.random() * 70);
        ctx.lineTo(Math.random() *...