With Cubase 10 it is possible to customize the colors very extensivly. The good thing is that many of previously hard color-coded elements like the Media Bay are the part of overall custom color scheme.
The biggest problem though are the automation lanes. By choosing lighter colors for project area background the volume lane without automation is barely visible.
The color of activated automation lane on the other hand is dependent on the color of the track, it belongs to. The default color of events is dependent on the color of the track as well. It is very difficult to find the right color for the track to have the events being not to dark and the corresponding automation lines being not too light and still to bee seen with the lighter background.
In order to achieve this ballance and make the non activated automation lane visible as well you have to tinker with the color of the track AND the color of the background a lot. This is very time consuming.
By the way, is the an option to have a default event color, which is independent from track color.