Maybe I'm alone to feel like this but the new GUI (almost colorless) is depressive ... makes me sad.
As a reminder about human behavior, we are more sensitive to colors than to shapes.
So it's easier to locate menus, tabs, buttons if they have colors (rather than having all the same sad grey color).
e.g. now I've to do an effort to locate 'Version Control' tab on the bottom
So please would you mind give us back the joy to use Idea.
Or at least provide a way to customise those.