Hi,
I made two themes: Light and Dark, which are based on the basic themes available in openhabian 3x.
I changed a little bit the color scheme and display of log items (e.g. I added highlights not only for Items but also for Rules and Things in different colors).
I replaced the colored text display with different background colors - it makes the logs more readable.
I corrected the display of INFO lines, which were displayed as error lines.
Maybe someone will like these themes. They are available in my github repository: