neave/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <style> body { margin: 0; } </style>
  </head>
  <body>
    <canvas id="wobble"></canvas>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js"></script>
    <script src="wobble.js"></script>
  </body>
</html>

## wobble.js
// Wobbly Surface - mouse over for fun blobbiness!
// As used on http://blog.neave.com
// by Paul Neave
// @neave

// requestAnimationFrame shim
var i = 0,
    lastTime = 0,
    vendors = ['ms', 'moz', 'webkit', 'o'];

while (i < vendors.length && !window.requestAnimationFrame) {
  window.requestAnimationFrame = window[vendors[i] + 'RequestAnimationFrame'];
  window.cancelAnimationFrame = window[vendors[i] + 'CancelAnimationFrame'] || window[vendors[i] + 'CancelRequestAnimationFrame'];
  i++;
}

if (!window.requestAnimationFrame) {
  window.requestAnimationFrame = function(callback, element) {
    var currTime = new Date().getTime(),
        timeToCall = Math.max(0, 1000 / 60 - currTime + lastTime),
        id = setTimeout(function() { callback(currTime + timeToCall); }, timeToCall);

    lastTime = currTime + timeToCall;
    return id;
  };
}

if (!window.cancelAnimationFrame) {
  window.cancelAnimationFrame = function(id) {
    clearTimeout(id);
  };
}


var mouseX = 0,
    mouseY = -100,
    mouseDist = 150,
    viscosity = 30,
    damping = 0.1,
    motion = 1,
    totalPoints = 20,
    updateID,
    points,
    color = '#f09',
    canvas = document.getElementById('wobble'),
    c = canvas.getContext('2d');

function Point(x, y) {
  this.x = x;
  this.ix = x;
  this.vx = 0;
  this.y = y;
  this.iy = y;
  this.vy = 0;
}

Point.prototype.move = function() {
  this.vx += (this.ix - this.x) / viscosity * canvas.width;
  this.vy += (this.iy - this.y) / viscosity * canvas.height;

  var dx = this.x * canvas.width - mouseX,
      dy = this.y * canvas.height - mouseY;

  if (Math.sqrt(dx * dx + dy * dy) < mouseDist) {
    var a = Math.atan2(dy, dx);
    this.vx += (Math.cos(a) * viscosity - dx) / viscosity;
    this.vy -= (Math.sin(a) * viscosity - dy) / viscosity;
  }

  this.vx *= (1 - damping);
  this.vy *= (1 - damping);
  this.x += this.vx / canvas.width;
  this.y += this.vy / canvas.height;

  if (this.y < 0) {
    this.y = 0;
  } else if (this.y > 1) {
    this.y = 1;
  }
};

function init() {
  var w = canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
  motion = 1;
  points = [];
  totalPoints = Math.max(Math.round(w / 50), 10);
  for (var i = totalPoints; i--; ) {
    points.push(new Point(i / (totalPoints - 3), 0.5));
  }
}


function update() {
  updateID = requestAnimationFrame(update);

  if (motion < 0.04) {
    return;
  }

  var p = points[totalPoints - 1],
      cx,
      cy;

  c.clearRect(0, 0, canvas.width, canvas.height);
  c.fillStyle = color;
  c.beginPath();
  c.moveTo(p.x * canvas.width, p.y * canvas.height);

  motion = 0;

  for (var i = totalPoints - 1; i > 0; i--) {
    p = points[i];

    p.move();

    motion += Math.abs(p.vx) + Math.abs(p.vy);

    cx = (p.x + points[i - 1].x) / 2 * canvas.width;
    cy = (p.y + points[i - 1].y) / 2 * canvas.height;

    if (i === 1) {
      cx = canvas.width;
    } else if (i === totalPoints - 1) {
      p.x = 0;
    }

    c.bezierCurveTo(p.x * canvas.width, p.y * canvas.height, cx, cy, cx, cy);
  }

  c.lineTo(canvas.width, canvas.height);
  c.lineTo(0, canvas.height);
  c.closePath();
  c.fill();
}

function wobble() {
  for (var i = totalPoints - 1; i > 0; i--) {
    points[i].vy += Math.random() * 100 - 50;
  }
}

window.onload = function() {
  var gui = new dat.GUI();
  gui.closed = true;
  gui.add(this, 'viscosity', 10, 50);
  gui.add(this, 'damping', 0, 0.2);
  gui.add(this, 'mouseDist', 10, 300);
  gui.add(this, 'wobble');
  gui.addColor(this, 'color');

  window.addEventListener('mousemove', function(event) {
    mouseX = event.pageX;
    mouseY = event.pageY;
    motion = 1;
  });

  canvas.addEventListener('mousedown', wobble);

  window.onresize = function(event) {
    cancelAnimationFrame(updateID);
    init();
    update()
  };

  init();
  wobble();
  update();

};
	<!DOCTYPE html>
	<html>
	<head>
	<style> body { margin: 0; } </style>
	</head>
	<body>
	<canvas id="wobble"></canvas>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js"></script>
	<script src="wobble.js"></script>
	</body>
	</html>
	// Wobbly Surface - mouse over for fun blobbiness!
	// As used on http://blog.neave.com
	// by Paul Neave
	// @neave

	// requestAnimationFrame shim
	var i = 0,
	lastTime = 0,
	vendors = ['ms', 'moz', 'webkit', 'o'];

	while (i < vendors.length && !window.requestAnimationFrame) {
	window.requestAnimationFrame = window[vendors[i] + 'RequestAnimationFrame'];
	window.cancelAnimationFrame = window[vendors[i] + 'CancelAnimationFrame'] \|\| window[vendors[i] + 'CancelRequestAnimationFrame'];
	i++;
	}

	if (!window.requestAnimationFrame) {
	window.requestAnimationFrame = function(callback, element) {
	var currTime = new Date().getTime(),
	timeToCall = Math.max(0, 1000 / 60 - currTime + lastTime),
	id = setTimeout(function() { callback(currTime + timeToCall); }, timeToCall);

	lastTime = currTime + timeToCall;
	return id;
	};
	}

	if (!window.cancelAnimationFrame) {
	window.cancelAnimationFrame = function(id) {
	clearTimeout(id);
	};
	}


	var mouseX = 0,
	mouseY = -100,
	mouseDist = 150,
	viscosity = 30,
	damping = 0.1,
	motion = 1,
	totalPoints = 20,
	updateID,
	points,
	color = '#f09',
	canvas = document.getElementById('wobble'),
	c = canvas.getContext('2d');

	function Point(x, y) {
	this.x = x;
	this.ix = x;
	this.vx = 0;
	this.y = y;
	this.iy = y;
	this.vy = 0;
	}

	Point.prototype.move = function() {
	this.vx += (this.ix - this.x) / viscosity * canvas.width;
	this.vy += (this.iy - this.y) / viscosity * canvas.height;

	var dx = this.x * canvas.width - mouseX,
	dy = this.y * canvas.height - mouseY;

	if (Math.sqrt(dx * dx + dy * dy) < mouseDist) {
	var a = Math.atan2(dy, dx);
	this.vx += (Math.cos(a) * viscosity - dx) / viscosity;
	this.vy -= (Math.sin(a) * viscosity - dy) / viscosity;
	}

	this.vx *= (1 - damping);
	this.vy *= (1 - damping);
	this.x += this.vx / canvas.width;
	this.y += this.vy / canvas.height;

	if (this.y < 0) {
	this.y = 0;
	} else if (this.y > 1) {
	this.y = 1;
	}
	};

	function init() {
	var w = canvas.width = window.innerWidth;
	canvas.height = window.innerHeight;
	motion = 1;
	points = [];
	totalPoints = Math.max(Math.round(w / 50), 10);
	for (var i = totalPoints; i--; ) {
	points.push(new Point(i / (totalPoints - 3), 0.5));
	}
	}


	function update() {
	updateID = requestAnimationFrame(update);

	if (motion < 0.04) {
	return;
	}

	var p = points[totalPoints - 1],
	cx,
	cy;

	c.clearRect(0, 0, canvas.width, canvas.height);
	c.fillStyle = color;
	c.beginPath();
	c.moveTo(p.x * canvas.width, p.y * canvas.height);

	motion = 0;

	for (var i = totalPoints - 1; i > 0; i--) {
	p = points[i];

	p.move();

	motion += Math.abs(p.vx) + Math.abs(p.vy);

	cx = (p.x + points[i - 1].x) / 2 * canvas.width;
	cy = (p.y + points[i - 1].y) / 2 * canvas.height;

	if (i === 1) {
	cx = canvas.width;
	} else if (i === totalPoints - 1) {
	p.x = 0;
	}

	c.bezierCurveTo(p.x * canvas.width, p.y * canvas.height, cx, cy, cx, cy);
	}

	c.lineTo(canvas.width, canvas.height);
	c.lineTo(0, canvas.height);
	c.closePath();
	c.fill();
	}

	function wobble() {
	for (var i = totalPoints - 1; i > 0; i--) {
	points[i].vy += Math.random() * 100 - 50;
	}
	}

	window.onload = function() {
	var gui = new dat.GUI();
	gui.closed = true;
	gui.add(this, 'viscosity', 10, 50);
	gui.add(this, 'damping', 0, 0.2);
	gui.add(this, 'mouseDist', 10, 300);
	gui.add(this, 'wobble');
	gui.addColor(this, 'color');

	window.addEventListener('mousemove', function(event) {
	mouseX = event.pageX;
	mouseY = event.pageY;
	motion = 1;
	});

	canvas.addEventListener('mousedown', wobble);

	window.onresize = function(event) {
	cancelAnimationFrame(updateID);
	init();
	update()
	};

	init();
	wobble();
	update();

	};