Whilst browsing Firebox I came across a really cool book that contains a polygon-style mask of either a fox or a skull. Now this is just the kind of thing I like so I did a little googling (other search engines are available of course) and found Wintercroft.com.
Steve Wintercroft and his wife Marianne have been designing and supplying all sort of magnificent masks ever since Steve made a Halloween mask which was well received by his friends.
There's a plethora of amazing masks to choose from including Halloween and half masks. The masks are sent as downloads so you can print them off at your own leisure. There's advice including a video to show you how to do this.