Glitterish

[DriesV]

Nice - I guess you did another slight offset of the sphere surface?

Yes.
There is a total of 3 spheres per ball, inner to outer layers:
*Base material (metallic paint)
*Small as possible offset (for a sphere, a simple scale did the trick) for the glitter material
*A slightly larger offset for the clearcoat (glass material)

Dries

[DriesV]

Here's a variation with thin film coating.

Dries

[thomasteger]

This is great. You could also try and use a label to get the coating effect.

[DriesV]

A final variation. Here I turned the base spheres into point lights.
The outer spheres are thin film.

Thomas, good tip about the labels!

Dries

[thomasteger]

Juicy glitter balls! Very lovely!

[crazybird]

A glittery (Stanford) bunny.

Dries

Ok mate, here you have the rock to sculp your bunny!

[PhilippeV8]

That looks awesome ... like natural Litracon 

[Pepster3D]

Wow those look AMAZING!!!