Check out this bumper sticker. It's a great way to get local leads, and don't limit your thinking to only your web site address. If you don't know where to get bumper stickers and decals inexpensively, just go to webdecals online and place an order. Plus, you'll like the picture on their web site. It should give you an idea or two.
Many distributors use magnetic signs with an offer or message to attract prospects.
They put one on each door and if they drive a truck or SUV, they also get one for the back as well. With magnetic signs you can take them on and off as you choose. Bumper stickers, window decals, and now . . . If you think a bumper sticker is effective, you know a large car magnet sign would draw even more attention. There's always plenty of room for your message as they can be made in any custom size.