For a long time, I've been using Arch Linux on an early 2013 15" rMBP. So these dot files are specific to Arch Linux and optimized to Retina display.
I use Numix as GTK themes, and KDE's oxygen icons for the HiDPI screen.
pacman -S gtk-engine-murrine oxygen-icons oxygen-icons-svg xcursor-vanilla-dmz
ln -s ~/.linux/gtkrc-2.0 ~/.gtkrc-2.0
ln -s ~/.linux/config/gtk-3.0/settings.ini ~/.config/gtk-3.0/settings.ini
Its own guide is under the xmonad directory.
Just refer vimrc, I use default configurations for most plugins.