A random DOM, opacity, etc.

http://benalman.com/

by Brodingo

CSS

html, body {
    overflow: hidden;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    background-color: #eee;
}

div {
    position: absolute;
}

div > b {
    width: 100%;
}

/*
div > b > b {
    width: 50%;
}

div > b > b > b {
    width: 80%;
}
*/

* {
    text-align: center;
}

b {
    display: inline-block;
    background: rgba(0,0,0,0.1);
    padding: 5px;
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    border-radius: 2px;
    -webkit-box-shadow: 0 1px 0 rgba(255,255,255,.4), inset 0 1px 2px rgba(0,0,0,.2);
    -moz-box-shadow: 0 1px 0 rgba(255,255,255,.4), inset 0 1px 2px rgba(0,0,0,.2);
    box-shadow: 0 1px 0 rgba(255,255,255,.4), inset 0 1px 2px rgba(0,0,0,.2);
     -moz-transition: all 0.3s ease-out;  
       -o-transition: all 0.3s ease-out;  
  -webkit-transition: all 0.3s ease-out;  
      -ms-transition: all 0.3s ease-out;  
          transition: all 0.3s ease-out;  
}

b + b {
    margin: 4px 0 0 4px;
}

b b b b:nth-of-type(2n) {
   -webkit-animation-name: pulse2; 
   -webkit-animation-duration: 2s; 
   -webkit-animation-iteration-count: infinite; 
   -webkit-animation-timing-function: ease-in-out; 
}

b b b b b:nth-child(3n-1) {
    background-color: gainsboro;
}

b b b b:nth-child(4n) {
    background-color: plum;
}

b b b b:nth-child(5n+2) {
    background-color: palegreen;
}

b b b b b b b:nth-child(2n+1) {
    background-image: -webkit-gradient(linear,left top,left bottom,from(rgba(255, 255, 255, .6)),
        color-stop(.05,rgba(255, 255, 255, .4)),
        color-stop(.5,rgba(255, 255, 255, .1)),
        color-stop(.5,rgba(255, 255, 255, .05)),
        to(rgba(255, 255, 255, 0)));
    background-image: -moz-linear-gradient(top,
        rgba(255, 255, 255, .6),
        rgba(255, 255, 255, .4) 5%,
        rgba(255, 255, 255, .1) 50%,
        rgba(255, 255, 255, .05) 50%,
        rgba(255, 255, 255, 0));
    background-image: linear-gradient(top,
        rgba(255, 255, 255, .6),
        rgba(255, 255, 255, .4) 5%,
 ...

JavaScript

// Randomly nest some divs
// http://twitter.com/cowboy/status/65845594400362496

function createPage() {
    var page = $('<div/>').appendTo('body');
    (function(s, n) {
        while (n--) {
            s.push($('<b/>').appendTo(s[~~ (Math.random() * (s.length - 1))]));
        }
    })([page], 200);
    return page;
}

var lastPage;
(function loopy() {
    lastPage && lastPage.fadeOut(1000);
    lastPage = createPage().hide().fadeIn(1000).delay(4000).queue(function(next) {
        loopy();
        next();
    });
})();