I've just launched crazy web page where I'm selling ad surface for your ads, logos, or any other picture you'd like to see printed on my car. www.getmeamini.com To get things going I started a blog contest with very simple rules. Write about the web page and blog contest in your blog and if you're lucky you'll get two spots on my car and sitewide banner on the web page for free! Read more about the idea and contest in this blog post.
I sure hope so I personally believe that this is a good idea in both on- and off-line world Online you get banner&link (and I guarantee the traffic, if all else fails with money) and offline your ad get curious looks, photographs, perhaps even pictures in newspapers