Can you change IntelliJ colors on per project basis?

Question

I often have 2-4 projects open at the same time in IntelliJ IDEA 15. It quickly becomes confusing switching between them, especially when classes are similarly named. Is there a

Answer 1

You cannot set colors on project level.

See IntelliJ Manual:

The settings that pertain to a project, are marked with the icon current_project_icon in the Settings dialog.

Color setting does not show this icon (and text "For current project") next to the title.