I think you are referring to the strappo process described by Ilia elsewhere in this forum. There was also an Italian company was painting on canvas, and then you were to transfer it like one of those temporary tattooes onto the wet plaster. Is does not seem to have been successful though. This was a few years ago that I saw their advertisement, and heard nothing since. I remember that the frescoes they were offering were overly fussy and poorly rendered.