Use Mac Desktop Wallpaper

Any of the standard Mac desktop wallpapers can be put on your iPhone with a few moves in iPhoto. I particularly like the Jaguar Aqua Blue of contrails and use it. Note that you'll be cropping the image to become a vertical image instead of horizontal:

• On your desktop go to HD>Library>Desktop Pictures (This is the folder where they're all stored)
• Drag the image of your choice to the iPhoto icon on your doc (This imports the image)
• Double click on the image to open it in the Edit mode
• Click Constrain
• Choose 2/3 from the list
• Hold the Option key while dragging the constrain box to full screen (This rotates orientation)
• Click Apply
• Click Done
• Drag the image to a folder you have set to sync with your iPhone

The next time you sync the image will appear in Photos on your iPhone. To set it:

• View the image in Photos
• On the bottom of your screen, tap the icon of the photo with the arrow coming out of it
• Choose Use as Wallpaper
• Tap Set Wallpaper

Those who are anal about saving space on the iPhone can export the cropped image and resize the export at 320 wide in iPhoto. Then drag this back into the iPhoto folder that syncs with your iPhone.