And polygonal. While you're considering making some of your own Halloween decorations, you can also consider getting some of these paper mask patterns from Steve Wintercroft.
His patterns are available on etsy and his website. You can go minimalist and just leave it the color of the paper you use or you can take the time to decorate it so it looks more like its source. Wintercroft explained how they came to be:
A couple of years ago, after receiving an invite to a Halloween party but struggling for costume ideas, I sat down with a pile of old cardboard, some parcel tape, a pair of scissors and plenty of hot tea. An hour or so later and after some trial and error I had made myself a fox mask.
I may make one of these and hang on it my all afterward.
[via My Modern Met]