These are some test images of a cold blue ice shader test.
Just a glass shader node.The settings are kinda excessive. Play with them like you want. 
The first image crashed after 82 hours of rendering at the GI step 

  So it is just a screenshot of the render view. 
I think the base was an edited version from AP with voronoi displacement (VoronoiRockComplex4 probably). 
Second image is my own different setup.