Using Dynamic Images in PDF Reports
There are a number of threads in the forum where we talked about dynamically including images in PDF reports before. In order to illustrate one technique you can use for doing this, I put together a sample application that illustrates how to dynamically include images that are stored in BLOB columns. I installed the application on apex.oracle.com and made it available for download and local install. You can find the link and login information for this application as well as the download link here:
http://marcsewtz.blogspot.com/2008/06/one-question-about-pdf-printing-feature.html