If the app doesn't have any sensitive information, then yes. We already do this with home screen widgets today, so clearly there's no real barrier.
Apps can have vulnerabilities (intentional or not). It's a contrived example, but maybe some weather app has a custom icon feature, which means you can then browse photos by opening it on the lock screen and going to that setting.
Apps can have vulnerabilities (intentional or not). It's a contrived example, but maybe some weather app has a custom icon feature, which means you can then browse photos by opening it on the lock screen and going to that setting.