I intended to make a tropical sky and this image is basically tropical – with a lot of haze, fog and some weird lighting thrown in. I have no idea how Bryce makes objects in a scene show up in colors other than what they really are. I can't create that colored effect found in some of the preset skies. I don't like the green tree and the beige sandy mountain showing up in violent shade of blue. Will try again tomorrow. And, this sky took three hours to render!