Here's a project I've been working on. A residence. Sorry, can't tell who's the owner due to the privacy issue.
All I can I say that it's done with ArchiCAD 12, rendered with ArtLantis, and final touches are done with GIMP. The last one proved to be a surprise hit for me since it's an open source program (meaning it's free!) and you still can expect results with a Photoshop-like quality.
Critics are welcome!