Even clipart from a collections disc can help add interest. So as not to break the formatting, add the pic before or after the recipe if it's easier. I often don't bother with actually uploading my pics to my site. I use Tinypic as a host to save bandwidth and simply insert the Tinypic code where needed.
There are lots of free clipart sites too or you can use one of the many paysites. iClipart.com has some great free drinks clipart and Boxedart.com is a favorite "full service" paysite of mine.