Sometimes Pottery Barn has some interesting things. I like to look for stuff like this at flea markets and antique shops too.

Here is a link that might be useful: some interesting stuff at PB

Pier I comes to mind. I just took a look at their website and I couldn't find anything, but there stores have some cool stuff.

Movin-on, I have the same wall art piece saved in my 'idea' file. I was thinking about getting a friend who does scroll saw work to do something similar. I thought I'd draw out the design, and then ask her to cut it out in wood. I was planning on painting it, but it could be stained. Or even painted with the paint that makes things look metallic. I was thinking about making the design similar to one in my rug...sort of scroll type work.

Well, these might not be quite that 'rustic', but they're still nature-themed -

http://www.walldecorandhomeaccents.com/four-piece-matilo-wall-sculpture.html
and
http://www.walldecorandhomeaccents.com/large-leaves.html

If you have a Kirkland Home store near you, they have something very similar to the Crate and Barrel piece. I was just in there today and I think I saw something pretty close.

Here is a link that might be useful: Kirkland's

What about Z Galleries - they have ALOT of art work! I love that place!

I saw what I believe is the same thing at TJ Maxx for about $40.

Try West Elm - that reminds me of several similar things I've seen there.

Here is a site I buy from often for more natural accents for my home:
http://www.vivaterra.com

Just click on wall accents for ideas.

Home Decorators has some interesting wall sculptures.

Here is a link that might be useful: wall sculptures

I've seen pieces like that at World Market and also Old Time Pottery....if you have one near you....

I was just in Target and saw 2 wood ones that looked similar to this. Target's price was $35. They were on the aisle near the photo frames. Over where they have the rotating home items next to the Smith & Hawk. aisle and the artwork wall.