I started this as an entry for the weekly challenge carnival, but didnt get to finish in time.  This is my first pixel art, but it was fun to try something new.  Feel free to use or change as you see fit! These should work with the following sprites:

http://opengameart.org/content/anime-style-male-base-sprite

http://opengameart.org/content/anime-style-female-base-sprite

http://opengameart.org/content/pagesofadventure-character-sprite-sheet

They will also work with sprites from http://themanaworld.org/

The masks are:

Alien, Phantom of the Opera, Pumpkin, and Opera Style