1. Create a folder with the Theme name in the Packages folder of Sublime Text (goto Preferences | Browse Packages)

2. Drag Textmate themes into the new folder

3. Goto Preferences | Color Scheme and they should be there!

Sublime Text 2 uses Textmate themes, so these work absolutely fine. Read the Github page for supported editors.

You can actually install it from Package Control in sublime text now. Tomorrow Night Eighties goes really well with Soda

Not only can you install the Textmate theme manually but you can also just use the Package Control app to install this theme automatically with no effort on your part.

Why not make one and submit a pull request?

Tomorrow theme is in the Sublime Text package manager... I know because I installed this two weeks ago via it.