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

The accepted solution is correct but remember that if you have more than one project (with PHPStorm version) open while setting the background image both will get it even if you check "this project only". My solution has been to close one project apply the background to the other, close everything and then open the first project.