How to change colors without reimplementing formatting?

[ThiefMaster]

The current choice of colors is not ideal, because the blue color for debug messages is pretty much unreadable when using the default ANSI colors on dark background.

However, I could not find any examples on how to change just the colors, and looking at ConfigurableFormatWriter it feels like a LOT of code would need to be duplicated to change the colors in an application.

A good alternative to making colors customizable could be to simply use a color for debug that looks OK on both dark and light backgrounds...