What to do behind toilet
if you put a red brick or a half a brick in the tank above the bowl it will displace water and you use less water when flushing, thus saving a bit on the utilities bill
Usually nothing should go behind a toilet - not much space there. You can find shelving and storage units that straddle the toilet and fit above the tank. What else were you thinking about?
Ok, I am curious . . . Trick for what? Painting? Wallpapering? Some other wall treatment.
Do you want to know how to clean behind the toilet. A shelf behind the toilet for storage? Putting a brick to displace water behind the seat in the tank? Need more info.
I think they just point up?
Maybe slit a garbage bag and tape it on the wall. Then change it when needed...