Special equipment: 2 pastry bags fitted with medium star tips; 1 pastry bag fitted with a round tip
Color 4 cups buttercream bright yellow in a medium bowl. Color 2 cups buttercream leaf green in a second medium bowl. Color the remaining 1/2 cup buttercream light brown with the ivory food coloring in a small bowl. Transfer the yellow and green buttercream to 2 separate pastry bags fitted with medium star tips. Transfer the light brown buttercream to a pastry bag fitted with a round tip.
Arrange the cupcakes on a large cutting board or serving platter as follows: Arrange 10 cupcakes in a tall U shape. Fill the inside of the U with 2 columns of 4 cupcakes (8 total). To make the pineapple stem, arrange a row of 2 cupcakes at the top of the U, followed by a row of 3 cupcakes, then finally 1 cupcake at the top.
Pipe stars of yellow buttercream onto the bottom pineapple section. Pipe vertical streaks of green buttercream onto the pineapple step (the top 3 rows of cupcakes). Pipe the brown buttercream in a crosshatch pattern on the yellow body of the pineapple, and then pipe small upside-down Vs at the top of each crosshatch.
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