Should we use colors, that are identified with Ubuntu and Canonical, I mean default wallpaper (orange and purple), logo etc.? I think that user should have possibility to change color theme as in Windows 10 and OS should support dark theme, in order to save battery and user's eyes at night.

What about Open Orange Linux? Orange comes from color, that is mainly used in Ubuntu's theme and symbol. Or we can leave orange behind and use lemon or another fruit, because they are colorful and tasty.