Bilder mittels Transform stapeln

HTML

<ul class="polaroid">
    <li><img src="http://lorempixum.com/200/200/" alt="Testbild"></li>
    <li><img src="http://placekitten.com/200/200/" alt="Testbild"></li>
</ul>

CSS

body {
    background: #eee;
}
.polaroid, .polaroid li {
    list-style-type: none;
    margin-left: 0;
    padding: 30px;
    float: left;
}
.polaroid li {
    border: 1px solid #999;
    background-color: #fff;
    padding: 10px 15px 30px 15px;
    float: left;
    margin-right: 20px;
    position: relative;
    z-index: 1;
}
.polaroid img {
    display: block;
    border: 1px solid #999;

}

.polaroid li:first-of-type {
    z-index: 2;
    left: 80px;
    top: 40px;
    -webkit-transform: rotate(60deg);
       -moz-transform: rotate(20deg);
            transform: rotate(40deg);
}

.polaroid li:hover {
    z-index: 10;
}