Heart Sand Art Bottle Necklaces. Brighten up your heart with colorful sand! A wonderful Valentine's Day craft, these hearts will give girls and boys a chance to show what's really in their heart. Fill these hearts by layering colored sand to create unique necklaces that are sure to be loved by all. Includes 1 funnel. Plastic. 2" x 2 1/4" on a 24" nylon cord. Requires 6 oz. of total sand to fill all bottles.