From the source it looks like it is coming from your tpl_molules_attributes.php file.
PHP Code:
<br class="clearBoth" />
<div class="attribImg"><img src="images/attributes/colorswatch.gif"
alt="" width="400" height="325" /><br />White</div>
<br class="clearBoth" />
When you see something you can't find, go into the admin developers toolbox and do a search. Usually you can find what needs to be changed pretty quickly. Also if you view the source on a displayed page it breaks up the sections and sometimes you can figure it out.
Steve