This theme is called Moonrise UI Theme.
- Install the plugin;
- Restart Eclipse and go to
Window > Preferences > General > Appearance;
- Select MoonRise (standalone) or, for a little better tabs decoration, install Eclipse 4 Chrome Theme from marketplace or from here and select MoonRise;
Take a backup of your preferences before importing a new one so you can safely restore them if you need (
File > Export... then select
General > Preferences);