Color Treatments

I've been browsing around photography websites,blogs, and flickr displaying photos of weddings or portraits and the one thing that I cant fully understand is how professionals do color treatments to give their photos a special kind of color to add mood to the scene. Its the kind of thing that I like to add to my photos.

I have my own way of creating it but I cant seem to get it perfect for other types of scenes. Maybe someday I'll figure it out.

I took this self-portrait last year with the Canon EOS 1000D. The light was from a window, taken at around 9am.