Being a curmegeonly type the sight of invitations etc printed on anything other than paper tends to make me roll my eyes. Once you start announcing social events on personalised wine bottles/cutlery/seashells I feel you may as well hire a male stripper with the time and date tattooed on his chest for any suggestion of dignity in the act of inviting is long gone and your friends and family may as well have fun with the invitation, if they can't pin it to their notice board.
However I make an exception for linen. I love linen, I especially love farmhouse style linen. With cows on. Or any livestock really.