A few posts back Dave mentioned ghost writing. I liked the idea but then thought that during my modelling period the ghosts would still be alive.
So an image search on’t tinterweb later had me a wall with a white painted advert for a long defunct local brewery. The image I found was taken at a slight angle so the image was manipulated with GIMP, sized and then printed onto a sheet of standard office paper. To get the image onto the brick work I coated the back using some “chalk” marker pens that I picked up in the stationary section in Boyes with chalk marks on wagons in mind. They are marketed as being for writing adverts on windows and blackboards.
Once the back was thoroughly coated I then drew over the image side with a pencil leaving an impression much like using tracing paper. This was then carefully painted in and a slight shadow painted around some of the letters as in the original. I am really rather pleased with the result.