This is a port to RStudio of the Apprentice color scheme (called themes in RStudio). Apprentice is a dark, low-contrast colorscheme for Vim. You can read all about it in the official repo where @romainl maintains it.
To install the Apprentice theme in RStudio open the Global Configurations menu and press "add ..." to add a theme. Select the following file:
Apprentice.rstheme
to install the theme.
I have tried to change the xterm colours as well, following the colors listed by romainl in the terminal ports of apprentice but I'm not sure anything other than the background is changing. This needs more tweaking and all suggestions and pull requests are welcome.
The TextMate file (Apprentice.tmTheme) was used initially as per the RStudio
instructions in the blogpost about custom themes.
I have left it here just in case it is of use to anyone, but any changes will
be made in the rstheme file.