If you get married in Venice, during the party your guests may wear the papier-mâche masks painted by hand … Or you might choose refined metal place cards, or joyful items covered with fancy card made by hand. 
Which better idea that the small "Olio Extravergine d'Oliva" bottles by "Il Palagio" Castle, one of the most typical products from Tuscany!
But even if you don not get married in Italy, why not to buy these unique and refined objects, which are certainly a non conventional gift to you your guests!