With **V10** we can use `RandomColor`

 Graphics3D[Table[{RandomColor[],
 Sphere[RandomReal[{.1, .9}, 3], RandomReal[{0.03, 0.08}]]}, {50}],
 Lighting -> "Neutral"]

![enter image description here][1]


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

![enter image description here][2]


 [1]: https://i.sstatic.net/OgBCq.jpg
 [2]: https://i.sstatic.net/uQ48d.jpg