The Yummiland Callie Birthday Cake doll encourages creativity with a DIY lip gloss kit. Each doll includes materials to create a custom lip gloss: a clear base, a unique color (represented as a "boba drink"), and a matching scent (in a "soda bottle"). Mix the components using the included spoon, seal the tube, and shake to blend. The doll itself features a signature Blueberry fragrance that matches its lip gloss scent. With six Yummiland dolls available, users can mix and match scents and colors from different characters to create over 50 lip gloss variations. The lip gloss tube includes a detachable keychain for portability or can be removed for doll play. The set also includes customizable fashions for added play value.