Add meta image to a featured image.

Hi. I’m looking for a solution to add a meta-image on different post.
(small icon-image on the featured image on a post)

Let’s say I have a site with tutorials, some free, some paid some with video etc. And I want to add a meta-image on different content on the site.

Example from http://psd.tutsplus.com/:
http://imageshack.us/photo/my-images/4/helpyb.png/

Somebody out there who knows how to do this?