Patrick - bacground is added in photoshop - original was gray. Bck texture is from google images. I've searched for "texture" and used first that seemed nice to me
Background is added in photo editing soft - original was pure gray. I've found interesting texture on web (here's link: http://computerartsroom409.wikispaces.com/file/view/texture-5.jpg/210359080/texture-5.jpg) add switch background on photos - very nasty and arduous work with cutting and pasting - I think that a lot simpler would be to just print this texture and shoot photos