Wallpaper. Floor to ceiling wallpaper: click your cell phone and it goes from beige 'paint' to printed wallpaper. Click again and it's grandma's kitchen - with Gram having morning coffee with you - click again - - Niagara Falls in real time...
They’ve already embedded ferrous materials in paints to make “chalkboard” walls. They’re magnetically attractant and actually a pretty neat idea for kids.
If they can embed organized strains of graphene in a wall covering, like wallpaper, then I don’t see why this scenario isn’t plausible. It would be a giant monitor on which you could display anything. They would, however, have to be static pictures, I’d imagine. Refresh rates, like with televisions and TFTs, are required to present a moving picture. Unless they can embed microprocessors in the walls or in the material itself, it wouldn’t have sufficient power to display a moving picture.
They might, however, have a way to make a slow-moving presentation look good. Something like slow-moving clouds or tides.
Again, the applications are almost limitless.