As for hanging pictures, use the comman strips. I just had my basement bathroom remodeled and we put up wood walls and I also didn't want to add holes if I could help it so I used command strips but without the plastic section, just the sticky strips. Also I've heard of a double sided tape called "Alien" but have no clue where to find it but my friend that uses it says all you have to do to remove the item is twist it and it comes right off without any damage. I think I might need to look for that stuff.