9. Oar Curtain Rod

An old rowing oar adds character to any window! Via: Country Living
10. Forged Nail Curtain Rod

I love the industrial and rustic feeling it gives. See instructions at Inspired by Charm
11. Painted Branch Curtain Rod

That is just simply amazing! Get the instructions: Less Than Perfect Life of Bliss
12. Rope and Bamboo Curtain

You can use something a little sleeker but still natural, like bamboo.
Tutorial via Primitive and Proper