This is, as always, the best way to save money. You can possibly save hundreds, or thousands, of dollars each year. Get a policy with a higher deductible. Should anything happen you'll pay more out of pocket, but chances are the policy will have lower premiums and pay for itself. If you have an older car, consider dropping collision and comprehensive coverage.
Insurers generally consider flashy cars more likely to be involved in an accident.
Use public transportation. You can pay lower premiums if you live close to your job and don't drive to work that often. People who live in rural areas also have generally lower payments than people who live in traffic-congested cities. Newer cars have upgrades that can lower your premiums. Ask your insurance agent about discounts for automatic seat belts, alarm systems, airbags and antilock brakes.