If, like me, you enjoy trying out different software, to get different effects, you may be interested in trying
OLONEO. It is a free beta at the moment and well worth a play.
A Quick Example
Not only can you process using the full HDR method of several exposures, but it also easily adds HDR effects to a single exposure. Visit the site and see the software in operation - very interesting especially the lighting multi- adjustments.
Roger