This colorscheme is inspired by Sarah Drasner's Light Owl theme for VS Code, and also by the existing Night Owl theme for vim by haishanh.
Load the theme using your favorite plugin manager. With Vim-Plug you would do this:
Plug 'harmenjanssen/light-owl.vim'
Then simply use it by calling colorscheme:
colorscheme lightowl
Heck yes you're going to be missing something! I wrote this on a lazy Sunday morning and checked with some PHP files, CSS files, and a couple of Javascript files.
I trial-and-errored Esilio's pre-baked list of Vim syntax groups, and I'm sure I've missed a couple or interpreted them incorrectly.
Pull Requests to polish this theme, or to add support for different languages are more than welcome.