well you asked so I guess since I mentioned it I am obligated to reveal.
It is most apparent in my daily backgrounds but I even used the technique on todays "white water",
take a look at my backgrounds and you will see a style that is one I have been doing for a few months.
When an image such as this is comprised of what I call layers I like to enhance those layers or distinct areas of color. In this image we have the cloud filled sky the sun strip and the snow covered ground, three very distinct areas. What I do is make a gradient that is either two or three colors and mix that color into the layers of the image. the easiest way to explain is to show you an example of what I might do with this image. ----
This is an Orange at the top, Fuchsia near the sun strip, and blue at the bottom gradient mixed in using soft light and about 20% opacity on a layer then the colors tweaked from there so they look more natural.
Im my opinion it accentuates depth and can add a totally different mood to a picture so I only use it when I fee it is appropriate. In this case it has warmed up the shot quite a bit.