There are various ways that image sequences can be set up to exploit electronic picture frames. Below are some examples.
Note some of the examples are presented as short video clips. In actuality they would be presented as a series of still images at intervals e.g. 10 seconds. So 500 images would take 83 minutes to cycle through. Or 365 images changing each day would take a year to cycle through, i.e. every day is a different image.