Invisible cars.
Two approaches to making cars "invisible" - change the look of the car, and change the nature of the car.
Art car and wire car via Science Forums.
Art car and wire car via Science Forums.

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Provided she's not stoned off her but, Lohan is hawt...
I guess that, since it was meant to be art, rather than an engineering or graphic design tutorial, such practicalities would detract from the artistic merit of the endeavor.
Warning! Sarcasm alert!
Just go to http://www.youtube.com/watch?v=dJfSS0ZXYdo, then
Didn't you read the links?
"A design student made a battered old Skoda "disappear" by painting it to merge with the surrounding car park."