Ray's quilt kit that he sells has a hood of sorts designed into it-I just know this from the pictures and reading about it on his site, so no idea how well it works. He also sells a hat kit mentioned above. A website called The Mad Bomber sells Canadian style trooper and bomber hats of all types-synthetic and rabbit fur.

Another idea is the Finnbar hood for really cold weather-
http://www2.smumn.edu/deptpages/~finnovations/Hood/hood.html

I have used a balaclava and fleece beanie-both work okay, but I am not wild about sleeping in them.