There's ways of do it with it looking warm. The stuff in the distances could have a purple hue instead to warm it up, but it'd still be blue cause oxygen reflects blue. http://www.google.co.nz/images?q=desert+plain&um=1&hl=en&tbs=isch:1&sa=N&start=20&ndsp=20 <- check out some google images. it'll give a better idea about how the colours shift in the distance. Unless the sky isn't blue for some reason, or there is more light coming from another light source that cancels it out. Of course, artistic licence comes into it too so it's up to you
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