This plugin is obsolete, please refer to https://github.com/chrisbra/Colorizer.
This is a (quite old) fork, based on hexHighlight.vim.
This plugin looks for hex codes of the format #ffffff or #fff and toggles a highlight in that color. It is useful for editing colorschemes, and generally any config file dealing with colors.
When looking for a Vim color highlighting plugin, I recommend https://github.com/chrisbra/Colorizer instead.
This plugin has the unique feature to handle
highlight definitions in a Vim syntax file though, but that might get merged some day.
Here is a screenshot: