Floor to Ceiling wall mirror - Wallpaper?
I would use the &quot;fake stained glass&quot; window products that are commonly available if doing anything to this. &quot;Privacy film&quot;, etc...
You clean the glass and they are applied with a mist of water and a squeegee to remove bubbles. They stay put (I've had them in a bathroom for several years on windows, as better than having curtains/blinds) and when you decide to remove them they can be peeled right off - since it's some sort of static cling rather than an actual adhesive, there's no fuss and no mess to clean up.