Nice snownut. Here is something you could try for the ice. It mainly the 
photons and dispersion that give it sparkle.

material {
pigment {color rgbt <1, 1, 1, .9>}
finish {phong .4 phong_size 30 reflection .05}
interior {ior 1.33 dispersion 1.1 dispersion_samples 20
media {
emission .1
samples 1, 2
density {
bumps
color_map {
[0 color rgb <0, 0, 0>]
[1 color rgb <0, .3, .3>]
}
scale 3
}
}
}
}

photons {
target
refraction on
reflection on
}

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