Ah, yes, you can download it as is available for free if you ask me. This resource of wallpapers are zipped, contain 33 Superheroes and Villains Wallpaper with various HD resolutions. See some wallpaper preview below:
I believe it makes you interested. Well, then have it for your phone's homescreen. Download it right now!
Download HD Wallpapers
File source: en.miui.com/forum