This will let you feature four of your items in a similar format to the beloved Etsy "Mini". (You can see my Shop Window in the sidebar to the right, down towards the bottom of the page).
You can pick either your four most recent items, or actually choose which four to feature, which is a nice way to create an artful little composition for your blog or website.
You can find the Shop Window at "My Studio", on the left hand sidebar under "Promote". If you seem to have problems, try refreshing or reloading the page, that seems to clear up any problems I had with the code.