Hello BitCoin,
The colors selected at the moment in the GUI are the fruit of a lot of tinkering and I don’t think our designers would accept a similar change lightheartedly 🙁 We actually have a plan to make the GUI customizable. The colors chosen are just RGB values and reading them from a file is trivial. Unfortunately there is no code yet. I created a Feature Request for this so you can track its status (receive notifications for any FR we implement by submitting a valid email address).
https://www.nomachine.com/FR01L02802
And for any other questions or nice things to say, you’re in the right place 😉