Select one of the sample images below or download an image from the linked site, then hit 'back' to return to the Orange app, where you can find the image in the gallery.
Search for "free png images" on a search site and you can download and use endless images from many free image sites. Here are links to some websites that offer free png images.
StickPNG - https://www.stickpng.com
If you upload a decorative image (png format) you created, you can share it with other users.
(Decorate your favorite celebrity photos and share them...)
In the Orange app, you can create a PNG image by saving it without selecting a background image in 'Photo Decoration'.