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Spreading frosting with a knife is so passe. By using a piping bag and a decorating tip, you can adorn that cake or cupcake with an elegant swirl of frosting. Piping bags and tips can be found at party, craft or baking supply stores, such as Michaels or Sur La Table. A 10-pack of piping bags runs about $6.50, and large decorating tips are about $2 each.