Preheat your oven to 350°F (175°C) and generously grease a Bundt pan with nonstick cooking spray.
Open the cinnamon roll cans and separate the rolls. Cut each roll into four pieces so they bake evenly.
Place the cinnamon roll pieces in a bowl. Add the melted butter, brown sugar, cinnamon, and chopped pecans. Toss gently to coat all the pieces.
Transfer the cinnamon roll mixture into the prepared Bundt pan. Spread the pieces evenly around the pan.
Bake for 30–35 minutes or until the top is golden brown and the center is fully cooked.
Let the cake cool in the pan for 10 minutes, then carefully invert it onto a serving plate.
Warm the icing that came with the cinnamon rolls for about 10 seconds in the microwave. Drizzle over the cake and immediately sprinkle purple, green, and gold sugar on top for the classic Mardi Gras look.