I just saw a site on the Internet today called myfreecar.com. It's a deal where advertisers will reimburse you in some way (I didn't read the fine print) for letting them turn your car into a mobile billboard. Again, just to show you kids (whippersnappers!) that there's nothing new under the sun:
In the early 70's, there was a program called Beetle Boards. If you had an old VW beetle, they would pay for a new paint job (one of those cheap-ass $99.99 ones) and then outfit you with big decals that you'd put on your VW. Then they'd pay you so much a month; I forget how much. But when you're in college and broke all the time, it seemed like a lot of money.
We got the Herbal Essence one, which looked pretty cool 'cause it was all sort of psychedelic.