One of the neat things that you can do with the MacDirtyCow and kfd exploits for iOS & iPadOS 15.0-16.1.2 and 16.0-16.6 beta 1 respectively is utilize add-ons that let you customize the designs of cards residing in your native Apple Wallet app.
Apple Wallet BG add-on for the kfd exploit is a no-jailbreak Apple Pay card customizer