Here is my first try.
This was modelled entirely in ArchiCAD and imported into Cinema as 3DS. It took approximately 10 minutes to setup the lights, water texture (only cinema's internal bump mapping of its own water shader, some transparency and reflections, no bitmap textures) and tweak the 50grey plugin. I'm impressed at how fast this GI emulation plugin is!
The whole render at this resolution took only 01min29s! All I can say is that it's simply incredible. I know it's just a very quick sketch and it's far from realistic or finished, but still I think that's great you can create such images in just a few minutes.
I rendered it in viewport and then used print screen, ctrl+v into paint so this way I was able to achieve some extra pixels beyond the 600x400 limit. Still I think I will be upgrading to the CE6+ version for unlimited resolution in the nearest future.
What a generous offer, Maxon! This opens up new possibilities to many of us. Thank you very much, indeed.