The Following are free to use privately, if you need to use one commercially just send me a quick email describing what it will be used for and where the final product will be. (Computer Backgrounds are located HERE).
Click the button below to find the type of download for each section. Click again to close the section
To Download: Right Click on image and go to "Save Image As..."
To Apply: Upload to Zune, navigate into your photos, view image, click the center button (or bring up the advanced options), "apply as background," and that's it. :D