Looking for a plugin/code that can retrieve the featured images from a category.

Here is the website http://ariadneswonderland.gr/

On the homepage I’m using a drop shadow box plugin
under the gallery to show a series of images of featured posts, as of right now, as i’m still building the website so it’s just lucky luke images inserted from media. What i’d like is to be able to do is have some code that pulls the 5 lastest posts from a category (in this case frontpage id 7) and have their images automatically placed inside the shortcode. Instead of having to retrieve and add links every time i want to change a feature.

Any ideas/code/snipets/plugins that you might feel would work would be greatly appreciated.