Mario and Luigi Hats, Polymer Clay Charm, Nintendo, BFF, Best Friends Jewelry Set, Miniature, Cellphone Charm, Keychain, Chibi, Novelty by misaberry on Etsy https://www.etsy.com/listing/220923092/mario-and-luigi-hats-polymer-clay-charm
Princess Peach crowns were made from foam visors turned upside down and cut like a crown and decorated. The Mario and Lugi hats were done the same way, but used matching foam to make the visor and super glued, then secured with hot glue. Of course, you can't have a Mario party without mustaches (Amazon.com). The kids loved it!