Install lab-themes from Melpa, and call (lab-themes-load-style
'light) (or 'dark) to activate the theme. The function
lab-themes-switch-style can be used to toggle between light and dark
variant.
If you want to install manually, copy lab-light-theme.el and
lab-dark-theme.el to somewhere in your custom-theme-load-path, and
(load-theme 'lab-light t) (or lab-dark).
The other directory contains the color setting for some other
programs.
