I have several photos of my Christmas Cactus in bloom and decided to play with this image. I cropped the original image and rotated it to the vertical that you see here. This is the original.
This is what happened when I played in Photoshop. This is the "hard mix" screen from the layers panel. Iwas surprised when this was the result. I have Photoshop CS4 and I still don't know how to use all the creative tools. So far, I've kept the playing simple. Works for me.