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 may want to set a different background picture for each project to distinguish them from each other. This could also be a single solid color picture for example. Enter Cmd+Shift+A and search for the Set Background Image action (Ctrl+Shift+A on Windows).