What does Barnes and Noble Know about Packaging?

Yesterday, I received a "bonus" gift certificate from an extremely satisfied client. The gift certificate card--itself--isn't the news, however.

The news is the packaging. What the client handed me was a four by five inch heavy cardboard "envelope" about a half inch thick. The package really presold the contents of the card inside, and added to my sense of pleasure.

As a Guerrilla Marketer, are you, similarly, "packaging" your expressions of thanks to employees, fusion marketing partners, and clients who refer others to you?