I don't know what colour who use and I don't think I have the blur opinions on the app.
When creating 3d objects your lighting plays a key factor in it. Colors usally are picked based on the environment, source light etc. For this one you could pick 4 shades of the same color to archive 3d effect. A blur tool is not what is needed instead a smudge tool
http://docs.unity3d.com/Manual/class-Light.html — ch1ris23
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ch1ris23
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