Thanks! Configurable colours are something I'd like to get done, too. About half the work has been done to achieve this -- none of the colours are hard-coded, they're all looked up from a big Colours value that gets passed around internally. This value just needs an interface so it's configurable by the user. I've been meaning to open it up to the community instead of just defining an ad-hoc EXA_COLO[U]RS environment variable, but y'know, time.