It's difficult not to get bored of Ubuntu's default brown look. Or perhaps even tired of waiting for the visual overhaul that's been speculated since Hardy Heron last year. How about taking things in your hand and adding some spice to the desktop with some cool Linux wallpapers for Ubuntu?
Here are 10 cool innovative Ubuntu linux wallpapers that would appeal to the Ubuntu enthusiasts!
The Dark Ubuntu
Ubuntu Wood Set
Ubuntu Bokeh
Ubuntu Metal
Linux for Robots 
I don't do Windows!
Ubuntu Denim [Broken URL Removed]
Ubuntu Poster
The Ubuntu User 
Ubuntu vs WindowsLooking for more? Here are a few sources you should check for these kind of wallpapers - DesktopNexus has an awesome collection of Ubuntu Wallpapers. Ubuntu-Art, DeviantArt and Flickr are other sources worthy of a mention.
Having a myriad of favorite wallpapers brings forth another issue - ideally you would want to cycle through them so that you can see them all at one time or another and it also lends that little bit freshness to your desktop. Well changing wallpapers automatically is easy peasy. If you are looking for something more flashy and feature rich take a look at other wallpaper changers for Linux and choose the one that suits your need.
One great thing about Linux is that you can customize even the slightest of details depending upon how much time you are willing to spend on it. While the result of a custom design would be truly amazing, it requires a fair bit of hacking and time. So you might want to check out how you can browse, download and apply themes right from the Ubuntu desktop. With tons of user contributed wallpapers, themes and icons, you can easily see time flying by when choosing the ultimate look and feel according to your choice.
And when you are done, let us know about it. Which Ubuntu wallpapers, themes, and icon sets are your favorites? We would love to check them out.