In the sewers, four turtles stand on a metal pipe, each one a different color. To their left, the brightest one is a vivid orange, to the right a deep red and at either side, two greens, one a paler shade than the other. The turtles each bear different weapons - two swords, a nunchuck, a staff and a bow and arrow - and look ready to fight any foe. Behind them, a small rat scurries along, disappearing into a dark corner.
To bring the image to life, start by using a dark green or grey for the background, to hint at the sewers. The turtles can be any combination of colors - try a vibrant orange for the brightest one, an earthy red for the next, and two greens for the last, using lighter and darker shades for contrast. The metal pipe and weapons can be silvery gray, while the rat sports a brown coat. Finally, use your imagination to add details such as graffiti in the background and shading for a more three-dimensional feel.