Here are some made by Karen from Bracebridge Ontario.

Tanya from Tanya's Mini Dolls has a tutorial, as well as one for a fan.
http://www.taynasminidolls.com/Tutorials/mask/index.shtml
For Halloween, your little monsters cam wear masks by Alice Zinn:
http://home-and-garden.webshots.com/photo/1047731230034817961qkHgEK