Download on http://skyrim.nexusmods.com/mods/45435
This is a complete overhaul of the Mountains and Rocks that are snow-covered. This is much more than a texture re-placer.
If you have used "Better Dynamic Snow", you'll known that the snow that settles on surfaces was an ugly pure-white and that mod improved it with using a snow texture.
Immersive Snow and Ice goes a step further by applying a special shader to the Snow for Mountains and Rocks, so that's its more translucent, giving it depth, reflection and refraction. Its the same shaders that are used for the glaciers of Skyrim, but this has been customized for Snow and Ice.
This is a beautification of your Skyrim experience. It is the combination of over a months work, so please enjoy if you are a person that likes to get the most out of the majestic vistas of Skyrim.