Here's a 1930s-style car at 28mm scale. I experimented when painting this one, using different shades of purple in an effort to make the application seem more natural, with shades fading into each other without sharp dividing lines. I'm pretty happy with how it turned out; the very dark purple wheel covers fade into the lighter body which fades into the still lighter roof.
You can see the effect a little more clearly from the rear.
I'm not sure what to call this car. It feels like it should have a name.