What about painting a wire strainer white and then doing the design on top in something thicker? It'd be like wearing a fencing mask, but a circular kitchen item... If you spraypaint the wire mesh, it should be relatively breathable and seethrough but still have the desired effect.

Trip to the dollar store! I will look for generic looking full face masks I can cut up. Or a kitchen strainer that's large enough. Failing that, Paper maché?