Ok so I forgot to take a picture of the first stage, me and my friend were having way too much fun.
So take one cheap mask, doesn't matter what its made from as long as you can cut it with a craft knife.
Draw on the mask the shape you want it to be (you will probably need to widen the eye holes at this point)If you want extra height or length then use masking tape to attach card cut to the shape you want to the mask.
Take your plaster bandages, wet and squeeze them then apply to mask. Cover all of the inside and outside. Be careful of areas you have attached you may have to use a few extra bandages to ensure they stay put.
Allow to dry, do not move onto stage 3 till the plaster has set. (me and my friend used this drying time to make brownies)
Ok so this pic looks odd but let me explain. Take some felt and glue to the inside of the mask. To push the felt into the shape of the nose and eye holes we filled a bag of water and placed it on top. I am sure there are other things you could use here but this is how we did it. Allow to dry.
Instead of fabric you can always paint it, this is an example of one of my painted masks which was built up using card. I have worn this out many times and I still get compliments since its so unusual.
I will be doing an earth, air, fire and water set next so keep an eye out for them.