Christmas ornaments are usually made from glass, plastic, or metal. Glass ornaments are created by blowing molten glass into a mold, which gives them a unique shape and design. Plastic ornaments are often made from injection molding, which involves heating the plastic and injecting it into a mold. Metal ornaments are typically made by punching a sheet of metal into the desired shape, then adding details with engraving or etching tools. All types of ornaments are often decorated with paint, glitter, and other embellishments to make them festive and beautiful.