What material/curtains are needed for a corona?

Question:What length and basically what curtain do i need for a corona? The one that goes on a wall above your bed and curtains hang from it? Thanks!

Answers:
I've see cornice boxes made out of card board ,but for the life of me i don't remember what show i saw that one.
see source:
hopefully it will give you an idea... remember to attach cornice in a stud so i wont fall on your head during the night :-)
as for the rest ...that depends on your taste.