I have set my phpstorm color scheme to dark theme - "Darcula" theme.
There was a pop up asking if I would also like to change my default look and feel to dark, I clicked on yes, but now I cannot switch back to regular look and feel!
Although the editor background changes according to the scheme, all the other window backgrounds stay dark!
File -> Settings -> Apperarance - Theme.
Then u can change it to whatever you want to again.
File -> Settings -> Colors & Fonts Scheme name.
This will change your editor themes and color.