To make the cone part of the hat, cut a circle out from the black felt, about 2″ across. Cut the circle equally in half and roll one half to form a cone. If the size is looking right for the rocks you have, use glue to secure the cone as is. If not, trim as needed until you’re happy with the shape and size. Cut another felt circle to be the brim of the witch’s hat and use more glue to secure the brim to the cone you just made. Set aside to dry.