Utility Panel - Customise

Some really nice improvements for dark themes lately,
but it seems the Utility Panel can't be customised...
...it's quite jarring for a dark theme - is that something that can be addressed?

Eventually. It takes a long time since each element has to be done separately and we get no help from the OS (in fact we're fighting against it).

If you really want everything black, there's always Window Blinds.