I have created a wallpaper. And to create a preview of the wallpaper. i'd like to have it previewed something like in a real desktop. So, i have found this PSD file to create the preview

http://nemed.deviantart.com/art/Led-...-psd-161898119

How can i use it in GIMP? any tutorials coz i've been searching on goole like forever now. Nothing found. This template have been widely used. So , i thought maybe i can find some help here?

or any website that provide the tutorials to use it. thank you