Markup for custom radio buttons.

radio_button_form.html

<form id="styled"> 
  <input type="radio" name="emotion" id="happy" />
  <label for="happy">
    <img alt="happy" src="http://i.imgur.com/zm8fp.png" />
    <p>happy</p>
  </label>
  <input type="radio" name="emotion" id="sad" />
  <label for="sad">
    <img alt="sad" src="http://i.imgur.com/sKhy9.png" />
    <p>sad</p>
  </label>
</form>