I'd really like to have a different colour with every new line of text. I spend time selecting each line and changing the colour that way. Is there a macro that would do that automatically for me?
Macros is not supported by Google docs. The best thing Google have done with a similar tool is Appscript that allows you to add custom menus, dialogs and side bars across all Google desk apps (docs,sheets,forms). FYI: not related to question Quickstart: Macros, Menus, and Custom Functions