You may think, “woh, styling the Eclipse 4 IDE must be really, really difficult“. In fact it is really easy, at least from a technical perspective. Of course making it beautiful is a difficult art and Roger is making a great job here.
But if you want to play with it, you only need to write a plug-in, create a CSS file and use the org.eclipse.e4.ui.css.swt.theme extension point to point to your file. If you export your plug-in, place it in the “dropins” folder of your Eclipse installation and your styling is available.
The “ugly red” styling below took me approx. 45 seconds to create.
What you are waiting for? Make your Eclipse 4 beautiful based on your own standards. See Eclipse 4 CSS Styling Tutorial for an introduction.