Thanks Mike. That is very helpful.
However the enabled "account and folder names" feature is just as ugly (more big splashes of color all over the message list). The previous version of AquaMail offered a nice clean smart folder message list without any color clutter. But I recognize that beauty is subjective, and other users have requested this new feature, so you can't please everyone.
If you decide to devote any further efforts in this direction, consider a more subtle approach. For example, the color refresh animation at the top of the list when a user swipes down is subtle, and quite attractive.
Regardless of the above, thank you for the constant innovation that you apply to this app. It is much appreciated.