Currently we are developing two UI themes: Windows XP and Mac OS X, I believe that the Windows XP theme will be finished within this week, and the Mac OS X theme may be next week.
Here is a screenshot of the Windows XP UI theme (which is still under development):
Windows XP UI Theme
In the screenshot, you can see the elements within the plot are rendered with Windows XP style, that means you can preview your software UI for specific platform, that’s cool 😉