Bear, Deer and Owl Masks: These masks are all cut from cereal box card and painted with acrylics.
Templates and instructions for all three of these masks are in the fall issue of Nuno Magazine. Purchase from this blog's sidebar.
The red bird is cut from cereal box card and painted with acrylics. The "feathers" are cut from a Tyvek mailer. Free pattern and instructions here.
The blue bird is cut from cereal box card, covered with burlap and painted with acrylics. Free pattern and instructions here.
More Mask Ideas from Other People:
Paper Plate Where the Wild Things Are Mask
Cereal Box and Tissue Paper Bird Mask
Cardboard and Egg Carton Bunny and Pig Masks
Venetian Carnival Style Mask made from Recycled Jeans
Last Minute Owl Costume with Little Cardboard Mask That Attaches Directly to Sunglasses
(This costume could also double as a Wild Thing when combined with paper plate mask I linked to above.)