A colorful, dark color scheme.
Use the plugin manager of your choice, here is an example for Vim-Plug:
Plug 'korabh/qwerty'
:PlugInstall
To preview:
syntax on
color qwerty
If you would prefer to use your terminal's default background.
The font in the screenshot is 10pt Inconsolata:
set guifont=Inconsolata:h10