When I became aware of Sublime, I noticed the benefits of dark themes to your workspace. But since Sublime doesn't have support for Grails at the moment, I search for ways to theme STS or SpringSource Tool Suite and I reached to this article. I tried the plugin and it worked well. Unfortunately, only the Editor area was change by the plugin.
The question is how I change the Color and Fonts of the whole STS or Eclipse?
1. Changing theme of Spring Tool Suite without downloading any plugin. (For using Darkest Dark Theme see option 2)
First, go to
Window > Preferences

Then in Preferences dialog go to
General > Appearance
after that select *Dark in the dropdown for Theme, after that click on Apply, then on Apply and Close

Then restart STS once so your STS will look like this

2. Changing theme of Spring Tool Suite by downloading Darkest Dark plugin.
First go to
Help > Eclipse Marketplace...

Then in Eclipse Marketplace dialog search for Darkest Dark and then click on Go.
After that from the search results install the plugin named Darkest Dark Theme with DevStyle

After that with default options selected click on Confirm

Then accept the license and click on Finish

Then let the software install

After installation completes click on Restart in the pop up

Then in the welcome screen click on Next

After that select Darkest Dark Theme and click on Next

Then let the STS launch with Darkest Dark Theme

Then click on Continue in the Tweak the Workbench dialog

Then your STS will look like this

If you use the current STS milestone (STS 3.0.0), then it is possible, because the underlying Eclipse 4 is now completely themeable. There are already some themes available, however you should consider them beta.
Here is a place to pick a color theme for your editing window: http://eclipsecolorthemes.org/
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