i don't believe that green cars are bad luck but i did find this on Motley Fool (
www.fool.co.uk) under ways to lower your car insurance =
"3. Car colour *
Some insurers have found that if you have a red car you're more likely to be involved in an accident. Hence, your premium can be higher. The only reason they can think of is that perhaps more show-offs use red cars, so these drivers are more likely to put their right-foot down.
Metallic paint is more expensive, so your premium might cost more. Some insurers find black cars are more likely to be involved in incidents at night. Conversely, white cars sometimes attract cheaper premiums because the opposite is found to be true. At least one insurer has found that green cars are more likely to be involved in accidents if you live in the country, because they're camouflaged! You can't see the cars for the trees."
So white is best for car insurance purposes. Colours not mentioned above are pretty safe.