Your personal stamp and sign off. Everything you make should relate to you in some way–it should have your personal touch. All designers have some sort of signature to their work, whether deliberately or instinctively, which is impossible to quash, however diverse the projects and client list.
If you have a furnishings business, the label you stitch on at the end tells the client you have signed the work off, that you are proud of its finished state….and if you can’t do that, it shouldn’t go out!