This is one of my self-training project. It's the Lamborghini Gallardor SPYDER (I did not design the car, just built it in 3D and played with some lightning / materials / render technique).
Tools: 3ds Max, Mental ray renderer, Photoshop
Render time: 20-30 minutes each image (1280x720px)
The 3D model is free to give away, please contact me if you want it for your work or study