I was playing a little with enhancing photos in gimp and while searching on Internet I encounterd this nice tutorial. It is really easy to follow and if you want you can even download a script for HDR look for Gimp. Link is down in the comments. Scroll down and you will find it.
Here is a photo of Echinacea Purpurea that I quickly edited to gave them a little different look. You could say HDR also.
