I have been using ST3 for a while now on test drive and I have checked out some of the themes currently available for Sublime Text 3. All of these themes are available via Package Control. I am also going to link the screenshots to their respective github repo in case you don’t want to use Package Control for some (weird) reasons.
Soda Theme
Soda is probably the most popular theme for Sublime Text
Flatland Theme
Cobalt 2
Nexus Theme
Reminds me of Google Nexus.
Pseudo OSX theme
Mac / OS X users are going to love this one
Reeder Theme
Here’s another nice one
Phoenix Theme
And it’s cool
Centurion
Which one did I miss?
So you know there’s a cool theme for ST3 that is not yet on this list? Please let me know in the comments, I shall add it.