One site that I read about a wedding in Tuscany recommended giving very small bottles of gourmet olive oil as gifts to your guests. But, there is the problem of shipping them back if they aren't staying long, have no place to cook.Still, it's a lovely idea, but not something to pack in a suit case... recommend shipping it home.
I also like these lovely soaps... They almost look like beach stones.
They are from Sofiart an Etsy shop located right in Rome.. easy breezy shipping if you are already in Italy :)