Simple and effective. Paper plates are a must! Sparkly Paper Plate Angel - for Sunday School I'd let the kids paint glue around edge and then sprinkle clear glitter or silver. Add a ribbon to hang. Write Bible verse on plate?
Manualidades para niños, máscaras hechas con platos
Have a roarin' good time with Playful Polar Bear Masks. These are very entertaining kids' craft activities both when you're making them and when you get to play. The masks can be constructed from items you already own.