What program do you use for that then?, I have little experience with image editing software myself.
(Myself and Eduardo just had a series of PM just to tweak some of the posts above to correct a few things. I came to realise he doesn’t speak a word of English and has to run every post through Google Translate. Respect to Eduardo for his patience) 
When you asked if I had created the style to be used in SketchUp, yes, it was I who created the Style, but I did not create the mask that was used for overlay. I looked it up in google images:
https://www.google.com.br/search?q=fog+texture&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiikYnVzv_eAhWBiJAKHdl6BlMQ_AUIDigB&biw=1366&bih=636
just do not ask me which one it is, because I do not remember 
it will be in your skp or layout file and can be saved back out to your desktop…
john
Here it is
