The Darcula plugin for NetBeans IDE has been verified by the community, which means you can now go to Tools | Plugins in NetBeans IDE 8.1 and install it directly from there:
Next, let's change the NetBeans editor so that its font and color themes match the Darcula look and feel that the plugin above has installed into the IDE. Go to Tools | Options and in the "Fonts & Colors" tab, select "Norway Today" in the Profile drop-down box, as shown below. That gives us a nice starting point. Let's now customize the Norway Today profile. Go to the Default category of "All Languages" and change the "Background" to "Dark Gray", as shown below.
Switch to the Highlighting subtab, as shown below, and find the "Line Number" category. Set its "Background" to "Dark Gray", too, as shown below.
Finally, change the font size to whatever you like. For example, I always use "Consolas 18 Bold", as can be seen below.
The only thing I'd like to do that I haven't figured out is to change the size of the font in menus, etc, to be larger. The default seems to be 12 or 13 and there appears to be no way to change that. Not really a big problem, though. But would be nice to be able to change that.