With V10 we can use RandomColor
Graphics3D[Table[{RandomColor[], Sphere[RandomReal[{.1, .9}, 3], RandomReal[{0.03, 0.08}]]}, {50}], Lighting -> "Neutral"] 
Graphics3D[Table[{RandomColor[1, ColorSpace -> "LUV"], Sphere[RandomReal[{.1, .9}, 3], RandomReal[{0.03, 0.08}]]}, {50}], Lighting -> "Neutral"] 