I've been having a play with Nvidia's Design Garage and taking a few screenshots.
Anyone with a GTX260 card and later can use this, and can be downloaded here
with more information on it here
It's interesting how it works and worth a look as you can get some really nice screenshots out of it.
The first two were from about 6 hours of rendering, and the 3rd one was just from a 2 hour render. The longer you leave it to render, the better the image is. Like I've also attached what it looks like if it's just left to render for about 5 minutes.