For iPhone users they can take an image in their photos app and create a sticker to use in the iMessage app. They have some cool features like animated stickers and I thought it would be cool to keep that animation from the message app to the journaling app. One is a glitter sticker for example and when you move your phone it reflects the movement in a real glitter sticker. Or animated stickers from Live Photos would also work in iMessage, it would be cool to have that option in your app too.