Samsung released 30 new watchfaces for its always-on display in the form of an application called ClockFace. The app is a part of the Good Lock 2018 app suite that the OEM introduced in South Korea. Unfortunately, the app isn't available for download using the Galaxy App store but there's a simple workaround.
The ClockFace app can be downloaded and sideloaded. There's a wide variety of watch faces in different styles and some of them add a bit more color to it if you are willing to trade a little bit of battery life. Usually, the Always on Display skins revolve around the black and white scheme as OLED displays draw less power that way.
Anyway, we remind you that the app isn't compatible to all Samsung devices - only those who have Super AMOLED screens, run on Android 8.0 Oreo and have the latest Samsung Experience 9.0 skin overlay installed.