Promoting Your Art While Driving

Here's an interesting way of promoting your art.
Barbara Rush has spent a measly $79.55 on putting this ad on the tire cover of her car. It's an image of her work with her website address clearly visible.
I think it looks really smart. It wouldn't work this well with every image or every car, but it's something for artists to think about.
She got the idea while doing a "Promote Your Art with Confidence" course with
Alyson B. Stanfield of ArtBizCoach.com.
I have also seen chrome or gold badges that can be made of your website Url, but I couldn't find their website.
Has anyone else used their car as a marketing tool?
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Art Marketing