There are a total of 16 images of the same sand-dune in the folder ... the one you like onto your iPhone. Now you have the image on your phone, go to Settings > Wallpaper. Choose a New Wallpaper ...

Might Hans Zimmer, the 21st century’s greatest evoker of mythic sandscapes, most recently for Dune: Part Two, employ a similar trick ... horrors’ – why The Thing game remains so chilling Wallpaper* ...