I have some very simple icicles that I made using the icicle generator addon.
I was wondering how to create a distortion/texture on the icicles to make it look realistic. Here is an example of what I am looking for.
This is pretty simple setting, mixed Wave Texture with Noise and used as Bump for Glass.
Before this you have randomization for Z position per object to make icicles looks different from each other. They should be separated objects.
It's not part of the question, but I'll try to briefly describe how to use it with this add-on.
To get this working you need to have UV Map for icicles. I've used Cylindrical Projection on all of them.
After this I've separated icicles - P > By loose parts.
Another issue could be Smooth Shading. Check here for solution: Smooth cone with glossy or anisotropic texture gets dark spot or use Flat Shading.