Vim-choosecolor is a project mainly written in Vim Script, it's free.
Insert colors using the OS X color picker.
This Vim extension allows you to open the Mac OS X Color Picker from inside Vim, and insert the selected color in hexadecimal (CSS) format.
It defines a single command:
:ChooseColorIt is recommended that you map this command to a shortcut of your choosing.
It is based on the [ColorX script][http://www.vim.org/scripts/script.php?script_id=3014] by Maximilian Nickel.