Are you looking for a more atmospheric feel for your game? Then I have good news for you!
I have made a fog where shadows of clouds will move across the map. There's some steps you have to do to get this to work, but it's nothing major. I'll help guide you through the process.
Step 1: When you've downloaded, and extracted the zip file, put the "cloud shadows" into the Fogs folder.
(I've included a psd file if you want to mess with the size, depending on how big your particular map is.)...
