Windows phone by default shows the default pictures it came with as a slide show in the photos tile. However below is how you can add a collection of pictures on the list.
- Launch photos.
- Browse through the albums as you like.
- Tap the “select” icon in the menu.
- Select the pictures you want to add.
- Tap the “favorite” icon.
- Navigate back to photos.
- Expand the menu by tapping the ellipsis (…).
- Tap “shuffle background”.
Now the tile pinned in the start screen will start to animate with the pictures in the favorites.