Bikes & Cars...

You’ve seen pictures of the Chevy Volt — that thing has been unavoidable for nearly two years now. And it’s always shown in that distinctive space-age silver with a slight greenish sheen. It turns out that paint color is nameless, and Chevy wants you to come up with something clever.

The prize, should your clever paint name win, is to test drive a pre-production Chevy Volt in Los Angeles. Use...