Personally, I would be rather peeved to be advertised to in this way. I wouldn't find it clever or cute--I would just find it annoying. I would not end up with a good impression of the company, and I wouldn't want to do business with it.
One reason why I don't find it particularly clever, is that it's really not all that different from all the physical junk mail I receive that tries to visually mimic some sort of important government notice.
One reason why I don't find it particularly clever, is that it's really not all that different from all the physical junk mail I receive that tries to visually mimic some sort of important government notice.