The Gold Desktop can be earned by completing all trophies. The price is shown as "?". Like the other desktops, it is downloaded from a link that can only be accesable by unlocking it. However, there is an alternate method to getting it, since some of you are lazy and don't want to get all the trophies. The pack of images consists in 13 images in 2 diferents situations one is the alien spaceship in the earth and the other is in the Paradise but this 10 images have a few little differences.
The download link is the third url.
The format of the desktop downloadable links are this:
Here's an example:
www.pixeljam.com/dinorun/bonus/DR_Download.zip (not actual link)
They are literally named after the content the person wishes to dowload.
Here is the zip
when you open the zip drag all the images to a folder that you must want to create.