This is a mask I'm making for a friend. He's cosplaying as the Phantom Renegade. It's really easy to make this mask, just takes 8 cuts and some pva glue to make.
It's very simple, just get a piece of A4 paper, cut 2 slightly diagonal lines at the top about an inch and a half from the edge of the paper. Then cut 3 straight lines at the bottom, making the middle cut an inch longer than the others. The you just slide one side of the cut behind the other and glue them.