Search For Images
Many apps and programs that you will use will have settings pages, where you can tweak and customize the settings that the developer has provided to tailor your use of it to your own needs.
The graphic shows a settings page for a particular program that allows you to search for pictures or images for use and to carry out that search automatically every so many days. The setting in place is for 7 days but it can use any number, including 0, which would mean that the program would not search for new images at all.