For a second I debated not sharing this and cutting down on the number of people with unique wallpaper, but then remembered there are millions of images out there to choose from .
In the market there's program called '[dodol] Custom Wallpaper Maker' which allows you to set any image as wallpaper.
Just go online and find a wide screen picture (1920X 1080 etc), save it and then use the program to apply. You can even use non wide screen images but you'll need to crop them.
The only downside is that for some reason the program reconfigures itself to be the only way to apply wallpaper. Which imo shouldn't be enough of a reason to dissuade you from purchase.