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.