The best craft not only requires creativity, but also produces something with high play value. Gather boxes, cardboard scraps and paper towel tubes to make a fantastic fortress with your kids. Start with a medium-size box as the base, and cut a rounded door in the front. Glue strings to the inside of the doorway and the bottom of the door to create the portal. Use paper towel tubes to create towers on the top. Create traditional castle edges by cutting rectangles from the tops of the towers. Fold 2-inch pieces of colored tape around a thin string, then cut the tape into small pennants. String the garland from tower to tower, and glue to secure. Fold a 2-inch piece of tape around the end of a chopstick or skewer and cut into a flag shape. Tape a stick inside each tube tower. Use colored tape to decorate the castle. Go as far as you want, adding architectural details like windows, cornices and columns.