Is there a way to assign an icon to a category post as well as the posts original image that's set in the featured images? 

So if had a post about grapes I would have an image of some grapes in the thumbnail but I'd also have a grape icon from the grapes category attached to the preview post. This is an example of what I mean <http://wordpress.thebebel.com/showcase/bloggaexport/> 

Thanks