iPhone OS 1.0-3.0
Plain black. Apple didn’t like wallpapers that time.
iOS 4, iOS 5
iOS 4 introduced multitasking and the ability to set the wallpaper. This one was the first which was promoted on marketing screenshots.
iOS 6 had a stylish, blue ripple as the default wallpaper.
iOS 7 changed everything, including the wallpaper. Even if the OS supported dynamic wallpapers now, Apple used this image as the default.
iOS 8 sticked at the blueish colors.
iOS 9 beta
iOS 9’s public beta version introduced a very attractive wallpaper.
iOS 9 had a new resolution for the default wallpapers (on iPad): 3208x3208. The image above is rescaled, because the original file is 26 MB, and Medium allows images up to 25 MB only…
Elegant new wallpaper.
Calm blue and sand colored image.
Vibrant red and blue colors.
iOS 13 introduced Dark Mode, and comes with a set of wallpapers which have a dark and a light variant to match the currently selected theme.