The "Joomla! Blank Content Plugin" is an empty plugin for Joomla developers. It consists of all the basic classes and functions that can be easily extended for its own applications.
This plugin is very simple. With a small code snippet you can place HTML-Codes directly into the content of your website. The code snippet is replaced by your individual string (HTML-Code). This could be a code to place an image, a text or any (dynamic generated) content.
You get a detailed description (german) on http://www.hoerandl.com/blog/item/joomla-blank-content-plugin-info