The three themes would have been, obviously, Terran, Protoss, and Zerg. I started my work with Terran, but over the past month, I became really busy, and was unable to continue this project. My personal matters being one thing, another hindrance I found was the fact that since this game is still in early development stages, not enough screen shots or images showcasing the depth and beauty of this game.
I apologize for not pressing on hard enough to make this theme.
For each of the theme, I was planning on making the borders and other images related to the race. For example, Terran would have a steal/carbon fiber look/feel to it, Protoss would have its infamous psi and bluish/purple glow, and lastly the Zerg would have its slimy purple creep.
Again, I was unable to finish the project, but this is the progress I've made thus far. If enough people ask, I might have a greater incentive to start and at least finish Terran within the next few weeks.
***Since I'm new to theming, I was testing what the slider would look like and decided to play around with it for a bit. The slider you see on there was just a test, and I took it from the thread "Customizing your TF3D" where it had a huge archive of TF3D customizations. The one that you see on there is the "Pebble"