You can use it to blend the varying color of sky's with the scene too. A bit like a multicolor haze. Just delete all the objects from your scene and render the sky of your image without clouds. Then add it as layer set to hard light or overlay or color, depending on what looks best and add the distance render of your full scene as mask to blend the strength. I used it on my "Flowering from the mist" image.

(_/)
(='.'=)
(")(")This is Bunny. Copy and paste bunny into your signature to help him gain world domination.