Welcome to CrXP Ali Shariq
I've tried to replicate some complex things in Photoshop and results were amazing (check this for instance) , if you have right skills and experience of a particular application (as Photoshop) then you can imitate almost everything , from icons to wallpapers , from natural objects to electronic gadgets.
The wallpaper you have showed can be redone in Photoshop if it's given proper time and attention , the only problem is to make all the process comprehensive to beginners , even if I provide the PSD file it won't be much comprehensive unless the learner has good skills
what program do you use BTW ?