This tweaks the darcula IntelliJ theme to better match the solarized color scheme found here https://github.com/jkaving/intellij-colors-solarized
To enable, after installing the color scheme linked above set your theme to darcula.
Preferences -> Appearance -> Theme -> Darcula
Exit IntelliJ then add the tweaked darcula properties file to the idea.jar file with the following command
jar -ufv idea.jar com/intellij/ide/ui/laf/darcula/darcula.properties