This quick article tells you how to make highlights to unpublished article content items when using a category blog layout. It helps a user/editor/publisher/you identify easily with a visual aid which articles are not published. We are only covering Joomla 2.5.x.
It is really easy to add some style sheet (CSS) changes to your template to make this work.
Simply add the following snippet to the bottom of your template /templates/your_template/css/template.css
Hope this helps you.