Quality fanfiction which is Snape-centric is hosted on this site. If you register, please check out my own fanfiction: Welkin in the Wizarding World, listed in the Occlumency archive under recently added/updated.
This was posted by ClaireVoyant in the Harry Potter Vs. Twilight spot. I though it was interesting to see Snape's birth profile. He was a Capricorn Slytherin of course.
okay, this is very rough. I was in class when i wrote this and so i had to keep track of where the teacher was. if you wish to add something else, please comment on this. I will try to add to it if possible. Thank you