There really are no limits to what you can make.
For best results i suggest having a cast of your face or somthing similar, to work off of.
I'm using a quick mock up form of modeling clay.
You will also need plenty of paper, scissors, washable school glue, paint and primer.
Step 1: Step 1
dont cover the bottom of the nose.
Step 2: The Horns
then fold a whole piece of paper in half length ways 3 times, gluing each fold.
You should now have a thick 1" by 11" strip.
Cut one end at an angle and wrap it clockwise around the cone from tip to base, overlapping each previous wrap.
Repeat this once more but wrap counter-clockwise.
Secure these by adding more layers to the base with strips that run up the horns and down the nose.
Finaly twist strips of paper into two cords and wrap the base of each horn.
Repeat until smooth.
Once dry primer the mask