This Xcode theme is inspired from Simon Wallner 'RailsCast' Xcode Theme. However, I did some changes to original Railscasts inspired theme based on my personal IntelliJ IDEA color settings: Colors were chosen to be relaxing and consistent. In the end, the eye strain is less and the theme provides a good focus on code.
Link to the official web site: http://xcode-railscasts-theme.helyx.org
If you have question, you can mail me: firstname(dot)lastname(at)gmail(dot)com ( Yes, you have to replace firstname and lastname ! )