Paint the paper plate and the paper cup yellow as the plate forms the base of the sombrero and the cup placed upside down on the center of the plate is the top. Let it dry. Once Dry, glue the cup to the center of the plate. Wrap yarn around the connection of the cup to the plate and glue it down as a decorative hatband. Then glue pompoms around the lip of the plate to decorate your sombrero.