It is easy to make fondant swags. The items required for making fondant swags are fondant, gumpaste, small rolling pin, few wooden skewers, and optionally a garland marker. As a first step, mix the fondant and the gumpaste and let them stand for one hour. Then do the markings on it using a garland marker. Now spread out some fondant-gumpaste mix and cut them to a rectangle. You could use little sugar on it.
Now place the rectangle on the cake between the markings. Slide the skewers under the fondant and run your finger on it. Use three skewers under fondant at equal distance and leave it for a minute. After a minute bring the skewers together and remove them slowly. Now place the swag between the markings and attach the ends to the markings. You could cut it if you feel it is a little big and then squeeze the end. Do this on all the sides of the cake. You could use butter cream or royal icing and decorate the top of the swags with shell, beads, or star.