40 car plates (520 x 110 mm) and 10 motorcycle plates (180 x 200 mm), each with a black frame. Embossed aluminium, real city codes from all 16 states, PBR textures, real-world scale. All plate numbers follow the official German registration rules. The frames are separate objects.

Automatic plate assignment (no script needed, Corona and V-Ray):
All car plates share one material, and so do all motorcycle plates. The plate shown depends on the Object ID (Object Properties > Object ID): 0 = first plate, 1 = second, and so on. Use the same ID for the front and the rear plate of a vehicle, and a different ID for each vehicle. Every plate variant is also in the scene as a separate material, on a non-renderable helper sphere in front of the plates.

The ad strip on the frame is a separate material layer: edit it or switch it off.

More countries? Write the country in the comments. The one with the most likes comes next.