I really like the idea of this contest. I bet some amazing work comes from it. However, I think it'd of been neater had you put more of a time-constraint into the contest. Say, cars from within the past 10-15 years. While I'm certain lots of old classics will see their untimely demise in this contest,that's something most of us have seen before in one shape or another. An old rusted out 50's vehicle.
It'd be interesting to see what people can come up with using "newer" automobiles, like a Prowler rusting in a field somewhere. Or a hybrid... oh the irony.