Color the sim cards based on the color from the settings
It would be nice, if the sim card color would be respected for the call buttons and in the call log. If you are interested in this feature, then i might even make a pull request for it. Also interesting for the SMS app.

Are you settings that color in your device settings or where? Does any other app show it?
Exactly, the setting is in the device settings and it is used by multiple apps to make it easier to differenciate between different sim cards.
- SIM pin input screen
- AOSP Dialer
- Google Dialer
- AOSP SMS App
- Google Messages
Maybe it is this? Just me googling for five minutes. I am not really experienced with android APIs. https://developer.android.com/reference/android/telecom/PhoneAccount#getHighlightColor()
Also this: https://android.googlesource.com/platform/packages/apps/Dialer/+/refs/heads/master/java/com/android/dialer/calllogutils/PhoneAccountUtils.java#40
If you want i can also send screenshots of the Google Dialer, have to activate it again though :D
@derrohrbach would be nice if you can add this feature :-)