KarolinaWallpaper Karolina blue has a detailed pattern of pretty bay leaves that create an elegant and organic setting. Karolina makes the room into a palace garden with luscious treillage. During the Gustavian era, bay leaves were often used in carved decorations on mirrors and furniture. Karolina is part of collection Arv that is inspired by the 18th century Gustavian era of Sweden.