The Payne's Gray background was turned red with a gel over my Sunpak 383. I think Ellie wanted a more mottled background so I experimented on this one duplicating the image two times and filtering with Render Clouds on the lower duplicate and then applying to it an Omni Lighting effect. Followed with a layer mask on the top layer (2nd duplicate)and painted with black to bring through the rendered background.
Isabel