After some discussion with other WWG designers, the classic scheme got a few minor changes and the addition of a police shield behind the door for a splash of color:
It's just a small, indistinct, and generic 7 pointed star with the suggestion of a city seal in the middle, but it adds quite a bit to the overall effect.
The UK version of the Interceptor has had additional work done to it as well. I changed the base color from silver to white, and split up the retroreflective decaling at panel lines and around openings so that it would look more like decals applied to a stock paint finish rather than paint.
The reason for changing the base color back from silver to white was to further differentiate it from the European scheme, which I based upon the blue-over-silver police vehicles in Germany, Poland, and elsewhere:
Also, I threw in a couple of little extra touches. The UK and European versions have a different license plate setup from the blue and classic versions. I even used the correct fonts and stuck with a familiar appearance for the plate backgrounds.
(Ignore the ABC123-ish plate numbers, those are just placeholders for effect.)
Yeah, I know, they're flying cars, they probably should have barcodes or some other spacey looking crap on the back, but I like to ground crazy stuff like flying cars in reality, at least a little bit, by adding some familiar and contemporary touches. It's an extension of my belief that if you want people to recognize some sort of fancy SF contraption as a coffeepot equivalent, it should look a bit like a coffeepot so people get the point straightaway instead of having to waste time with boring and unnatural exposition from characters.
Besides, I don't think number plates are going to go out of style because the old "Did anybody get the plate of the truck that hit me?" thing doesn't really work if pedestrians have to chase after vehicles on foot with barcode scanners or some silly shit like that. I figure the cars have ID transponders in them that police cars and flight control systems can interrogate, and the plates are just a visual convenience or fallback measure. Sometimes the simplest things work best, and that's why they stick around even though you can replace them with something that would make Rube Goldberg golf clap.