The highest ranked NetBeans theme on the truly brilliant NetBeans Themes site replicates Sublime Text and looks really great. Click to enlarge the screenshot below to see it in context in NetBeans IDE 7.3.1:
I have no idea who is behind that NetBeans Themes site, but it's an amazing contribution to the NetBeans community. Just take a look at the themes on the site, choose one, download its ZIP file, go to Tools | Options in the IDE, click Import and then browse to the ZIP you downloaded. You can also upload your own themes to the site, i.e., configure NetBeans IDE the way you want it to be, export the settings by clicking Export in Tools | Options, click Upload Yours on the site and you're done. Wonderfully simple and a wonderful site!
In other news. My internet discovery of the day is Comedians In Cars Getting Coffee! Excellent.