It would be helpful to know which device you have, it would allow us to provide exact instructions, but without knowing, in general, many devices have a Theme app or setting. To find out if your device has this, open Settings, tap the magnifying glass and search "theme", and open the setting or app on your phone and you will likely find the image in a gallery here.
I have a Sammy, so for me Themes is an app. If you have a Samsung also you can see in my screenshots the two folders to look in for this image. Along the bottom of the app tap the Menu tab, and then tap Purchased items, which is obviously items that you bought or downloaded in the Themes app, or tap My Stuff in the upper left corner, and these would be the items you've brought with you from other devices or used in the past.
Let us know what device you have for more specific advice.