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As templating as that sounds, you'd need a female die backing each hammer-blow to form an effective dimple, otherwise you'd get a low spot with a ding at the bottom.
As a first approximation, assume the dimple on a car should be the same size as one on a golfball. The scale isn't that far off. Then assume a different way to interact with the air may operate on a different [smaller] scale. Then consider the Lotus flower that is hydrophobic and therefore self-cleaning.
A small-scaled widespread aero-phobic pattern that could break the grip of the wake on the afterbody would be awesome, even if it only come in red.
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