Assuming you do not have language-specific color profiles set up, you can record a macro to change the default color scheme.
Macro > Record Macro
Tools > Options... > Appearance > Colors > (Change Default color profile)
OK
Macro > Stop Recording...
Give the macro a name, e.g., set-color-chalkboard
Save
Then you can add that command to the list of commands to be ran when you open a workspace/project.
Project > Project Properties... > Open
Add set-color-chalkboard
If you want different colors for projects because the projects are in different languages, I'd just use the language-specific color profile settings.