I'm going to have to withdraw my interest on account of not being online enough to ever hope to keep up with this. Sorry guys. Still, good luck with this thing. 

Oh, and before I go, [@Emma] I happen to have come across a few bits of folklore about Marzanna in my time. I take it you are talking about the Polish, or at least West Slavic, version of Morena. The queen of winter. Well, she is often depicted as corpselike, even half-decayed. 

In the Russian tradition, Morena was once a powerful mortal sorceress who earned the favor of the gods and was granted a single wish. According to the Russians she wished for eternal life, but she forgot to ask foreternal youth to go with it. And so she grew old physically. Eventually her body even started to decay like a corpse even though it could not truly die. And so she ended up cursed, rather than blessed, with eternal life. 

Now in the Polish tradition there is a related deity called Smiertnica. She is very similar in form, with her golden scythe and corpselike appearance, but functions mostly as a psychopomp and less so as a winter goddess. Now Smiertnica is related to a category of Wendish psychopomp spirits whose name escapes me right now, who appeared as very creepy children, kind of like a morbid combination between the classic child-ghost and the old Changeling: the Dreaming Sluagh. 

Anyway, I hope that the info is useful to you.