If you have multiple photos you enjoy having as your Lock Screen wallpaper on your iPhone, you can rotate through various photos that will shuffle as the wallpaper. You can manage the frequency of how often the photos shuffle to personalize your iPhone.
How to use Photo Shuffle
In the Settings app, tap Wallpaper
Tap Add New Wallpaper
Select Photo Shuffle from the top row of options
On the Photo Shuffle screen, set a frequency (On Tap, On Wake, Hourly, or Daily). Then choose a set of photos that will shuffle as you use your iPhone throughout the day.