I've used the RailsCasts theme[1] for ST2 for 3 years now. I've tried other ones but always went back. I even use it for non-Rails development. It's just got the right amount darkness and text color contrast which benefits readability.
I started using the Railscast TextMate theme a few months ago and have been quite satisfied - it's got a dark grey-ish brown background. http://railscasts.com/about
https://www.google.com/search?q=railscasts+theme&client=safa...
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