Fuente: WIPO "essential oil or extracts" Apparatuses, systems, and methods are disclosed for a complete diffuser and a two-part decorative diffuser cover. The two-part decorative diffuser cover has an inner cavity shaped to receive the complete diffuser. One part of the two-part decorative diffuser cover is removable couple to the complete diffuser. The two-part decorative diffuser cover forms a single decorative structure when both parts of the two-part decorative diffuser cover are joined together.