A custom Porsche Cayman GT4 RS, listed for sale by Porsche Bellevue in Washington, US, features a unique "dream spec" color combination. The car is primarily finished in a bright green, identified as Birch Green, with contrasting blue accents on parts like the wheels, wing mirrors, and rear wing. The interior continues this theme with blue leather trim on seats and door panels, complemented by green-painted accents and blue contrast stitching.