Big red buttons are a must, it seems.
Themes change the way your workspace looks and feels. Basically, if you don't like how something looks, go ahead and change it! Take this cool theme, for example.
Here's an example. Cool, huh?
If you're an artist or graphic designer, these themes can be a great way to showcase snippets of your art to a wider audience. Or if you're just looking for a break from nuken's default appearance, themes can give your workspace a personal touch.