1. Make sure you have the desired photo in your iPad's photo album
2. Open the shelf, tap on the material section and scroll all the way down to "User Materials"
3. Tap on "Photo" then tap on "Add a Photo" at the bottom
4. Navigate to the photo in your photo album popover that opens.
5. Tap on Objects, scroll down to "Decorative", tap on "Paintings" and add any of the first 9 picture frames to your plan
You can now drag your custom photo from within the user material section onto any object.