Thanks Hal for bearing with me on this one. Will try with your suggestions.
Just to be clear on yellow/green comparison, here, I've added an RGB 255,255,0 square to the images with Paint.NET. This square is yellow and walls are greenish (according to my wife, and that is the most important judgement ...

Thanks Hal. Now I see my screenshot were a little oversimplifying, I made it just for better explanation. We don't want yellow floor (for sure, then we could be crazy, with yellow floors and yellow walls [:)] )

Here is the real-thing what we are trying to arrange - white kitchen, connected with ...

Thanks guys for your reply.
I do understand there are shadings in real life with possibly quite a big difference in one area depending on lights.
Bottom line is, these colors look so much too green to us. Maybe it is our monitors or eyes, or we're just crazy I don't know [:)]

@hal9000, on what you ...

Like in real life, the color of each face of an object depends on its orientation towards light and towards the viewer. Under strong light, some colors can get overexposed and green could be seen as yellow for example. Choose a darker color if you don't want that effect, or reduce the light ...

I was a bit wrong with the previous post. Not all horizontal objects are correct.
I just set a carpet to yellow (the carpet has a table sitting on it). Just by changing the 3D view head angle I get different shapes of green and yellow areas being drawn on the carpet. Every change of head angle, even ...

I am facing the same situation. Even if I set color of the walls to pure yellow (RGB - 255, 255, 0), I get a green color in 3D view. I do understanding shadings are involved with walls, but this kind of a difference looks very strange.
After further testing, seems that anything vertical (like walls ...