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Art has no rules, yh, sure they do. Clouds are white, grass is green. Or is it?
A good example of a sky background in ISO is habbohotel, Without the sky in the background, the hotel would'nt look that great. The designers of the hotel are proffesionals, in ISO pixelart that is.
And what about if I wanted it to look like it was standing in top of a hill? Which is just what it looks like to me.
I could even make a sun in the backround without making it look stupid. 
Background in ISO will always be an unwritten rule , as long as it doesn'nt look stupid to me.
"It looks like the mansion is sliding down the hill... If the picture is isometric do not even try to picture blue sky (in order of a piece of advice)."
Read the description of background, I had to put a background there. And the rule about not having a background in ISO is just stupid.
too much red o.O