Lamborghini Aventador $4.7M
German auto designer Robert Wilhelm Gulpen has done it in platinum, gold, diamonds, and of course in carbon fiber. The rims are to be platinum while the suspension will be crafted out of solid gold.
This model have approximately 700 diamonds embedded into the interior alone. The rest of the body parts will be carbon fiber, just like the previous model. Have your $4.7M (approx. 3.5M €).
If you have too much money, you can buy this model car at an auction in NYC later this month.