Martha Stewart has some of the most interesting.
Another fascinating take using sunflower seeds can be found at Better Homes & Gardens
For traditional carving here are some links to interesting owl patterns:
- Zombie Pumpkins - this one is a bit difficult, you need to be a member to print but the site has many unique stencils.
- Fantasy Jr easy owl stencil
- Celebrating Halloween has an owl in a tree plus some more interesting ideas including a Ganesha pattern.
- A scary tree with owl
- If you don't want to carve a pumpkin use some stick on's like this one from The Cute Little Shop