Foreword
I have forked this from Tpope's Vividchalk and slightly modified it.
All credit goes to him. Check him out. He has many great Vim plugins.
Installation
call plug#begin()
Plug 'ParamagicDev/vim-medic_chalk'
call plug#end()
colorscheme medic_chalk
Below is a sample for ~/.Xresources taken from RomainL
*.foreground: #FFFFFF
*.background: #000000
*.color0: #000000
*.color8: #111111
*.color1: #FFA500
*.color9: #FF6600
*.color2: #66FF00
*.color10: #99CC99
*.color3: #FFCC00
*.color11: #FFEE98
*.color4: #5F87AF
*.color12: #33C9C9
*.color5: #9933CC
*.color13: #AA1BF2
*.color6: #88B5C3
*.color14: #AABBEE
*.color7: #FFFFFF
*.color15: #808080
Differences from VividChalk
There aren't many differences,
I changed the way the auto completion menu is handled.
I also changed the fact that the current cursor row was underlined.
I also changed how splits appears, colorcolumn appears, and how matched parentheses appear.
Altered fallback values for GUI StatusLines and Normal highlighting.
Altered the way non-current status line is highlighted.
Added a highlight link for NERDTree (Sorry TPope, I know you like NETRW w/ vinegar)
Added a color palette to the README for easier porting of the colorscheme.
Overall, it's pretty much the same just with a few adjustments. TPope did All the heavy lifting on this one.