Checkout https://github.com/jeeeyul/eclipse-themes/ for a new Chrome theme. The update side is listed below and the main website describes the setup and the available customization.
I think this theme is a great example of an initiative of improving Eclipse 4 for others. Eclipse 4 provides a set of technology which makes it easy for others to contribute, hence the Eclipse 4 core team is not the only group in the world which can help.
Especially nice if that customization of the white space. Here a screenshot which shows the related preference page.