clouds

This script changes a rainy landscape to a sunny one.
Copy it into the scripts folder from GIMP, you will find it then under Filters -> Light and Shadow -> Sunny Landscape:
http://docs.gimp.org/2.6/en/install-script-fu.html

If you like it, hug someone.
Before:
http://www.flickr.com/photos/srgblog/2477297713/

To fix burned out or white skies by adding clouds and a blue sky gradient (using a threshold mask).

Guide to Using the Blue Sky & Clouds Script