thats just texture of the item I think some people are getting sugestioned by the "idea" of the dynamic snow but it is not happening , I haven't testimonied it and I still have to see anyone post a "true" prove...
I have experienced dynamic snow effects by travelling, often in the mountainous areas.
I haven't seen footprints but the covering definately builds up.
I could send you a picture but I honestly can't be asked. It's in your game there for you to discover.
As for intelligent Radiant AI they were doing this back in "Oblvion".
Mazogah the Orc once came up to me and without opening a dialogue box, proclaimed she was going to hunt some "Black Bows" and I could come along if I wanted.
She took me to a cave that was full of Black Bow bandits and we cleared them all out (How could I say no... she's voiced by Wonder Woman).
Azrael
The Nord with the Sword

)" along with a bunch of other stuff in the note. At first I was like "Uh Oh, Brynlin's going to get it - I have dirt on her now" but once I went back into town and realized that there was no quest related to this and that Brynlin still acted the same, that this was a product of that AI. I re-read the bounty notice and the key word was "thief". I had stolen from her house so she put a hit out on me. 