Sometimes it's fun to take an image into Photoshop (or other photo editing software) and just fool around. And, sometimes its nice when learning a new technique that I end up with an image I really like, and there is nowhere else to put it, so it ends up here. Sometimes the changes are very obvious, and sometimes they are very subtle, but the scene has been altered.
AND, sometimes the experimentation happens in the camera. I try something new, and then count on Photoshop to help make the image tell the story I want told.