Thanks guys, I can't take credits for the colour scheme, because I got "hints" from a professional person. I got some freedom, like how much or where to put colours, but I followed a specific colour palette.
Regarding lighting, I'm using more and more a technique that I've picked up following some tutorials. It belongs to Fernando, and basically, is the use of the GI, with a big multiplier, without any map (sky) applied. V-ray users know, that if the light coming from the sun is not enough, sky portals in windows should be used. It's a shame I can't try the beta version, because I have no time lately, and it doesn't sound right to me to install it, and not to give proper feedback.
Cheers,
Stefan