This is in the works, fully customizable theme support is being implemented that will allow customizing colors for virtually everything. The theme support will come with a couple of prebuilt themes, but will also allow creating your own that can be copied, edited, shared, and imported.
I’ll be setting up a free service for this where users can publish their themes, browse community themes, and install community themes within Arctic’s settings.
Regrettably I did not implement theming support earlier in the project, so there is still a lot to be done before this will be ready for testing.