New Pottery Barn National Lampoon’s Christmas Vacation Griswold House Cork Placemats. Give your guests something unexpected at the table. This easy-to-clean cork placemat adds color and a sense of fun to the table. Experience all the humor of the Griswold Family in our exclusive National Lampoon’s Christmas VacationT collection. Overall: 16″ w x 12.75″ d x 0.25 th. Crafted from wood, paper and corkboard. Clean with soft, damp cloth.