Don't know if this texture would be of any use to you, its the cloud texture I use with il2...
sadly I don't know the original author, its been plucked from my mod soup.
full size 1024x1024 with an alpha channel...
http://www.mediafire.com/download/zb...2svi/Cloud.tga
also got this one, its a bit fluffier...
http://www.mediafire.com/download/hd...2wq/cloud2.tga