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Prepare cake mix as directed on package, stirring in orange extract. Bake in foil-lined 13x9-inch baking pan as directed on package. Cool cake in pan 15 minutes. Invert cake onto wire rack; cool completely. Transfer cake to serving platter.
Stir 1 teaspoon of the vanilla into 1 can of the frosting. Tint frosting grass green with 24 drops green food color. Frost cake with green frosting. To make frosting resemble grass, touch frosting with a small spatula then pull up.
Stir remaining 1 teaspoon vanilla into remaining can of frosting. Reserve 1/4 cup of the frosting in small bowl. Spoon remaining frosting into piping bag fitted with a small round tip. Or spoon frosting into medium resealable plastic bag, snipping a small corner from bag. Pipe yard lines across the grass. Tint reserved frosting brown with cocoa powder and 2 drops each red and black food color. Spoon into small piping bag. Pipe a football shape on the cake.