As to a practical use:-
We have antique leaded glass panels which sit along the base of the front windows of the house. They are very attractive indeed, from both inside and out - but they have the wonderful added advantage of making the windows impossible to see through, from the outside

- without having to resort to net curtains (shudder).

But I think I'd use your advertising one as target practice. I detest advertising - especially of this subject - though macdonalds would be worse, I suppose.