Papyrus Birthday Card Cake Castle Now all you need is a mermaid to sing "happy birthday"! Made with real sand, this cool birthday card features a tiered, sandcastle cake with gems, raffia and seashells. Size: 5 in. x 7 in. (127 mm x 178 mm) Process: Tip-on gems, sand, raffia ribbon Envelope: Cream with turquiose liner