If you want to use the (badly implemented!) solarized color scheme in your Rubymine IDE:
Clone the IntelliJ IDEA port:
git clone https://github.com/jkaving/intellij-colors-solarized.git
Import the settings in Rubymine by chosing the above directory File -> Import Settings
Change the color scheme in the settings (Ctrl-Alt-S) in Editor -> Colors & Fonts
Note that selecting a color scheme will also reset your previous editor font choice. You might want to change the font to Envy Code R Show archive.org snapshot or something.