I know that one too, but it's not the one I am looking for.In that one the clouds were already made from photographs.I am not intersted in making clouds.I have given that tutorial as an example hoping you will know what I am looking for.I am interested in the process.If I will find the process, that will apply to all.
I will post a link to the tutorial when (if) I will find it again.Then you will understand what I mean.
Thank you!