Use of filter and drop shadow
Your code it's perfectly fine

I would just change, to stress the fact that the images are the same:

.container img {
    width: 250px;
    height: 250px;
    content: url("http://iancottam.co.uk/img/footy.png");
}


and then 

&lt;div class="container one"&gt;
   &lt;img&gt;
&lt;/div&gt;
&lt;div class="container two"&gt;
   &lt;img&gt;
&lt;/div&gt;


jsbin