When you see something written on a restroom stall certain expectations come to mind, this time however I saw something that defied my expectations.
So far I was only able to find example of something like this. At some universities messages like this are posted on the mirrors of the women's restrooms. This one is from Montclair State University.
Positive messages could be integrated into tile-work, custom decals, etc. Messages could be integrated into walls, floors, mirrors the possibilities are limitless.