Is there a Vim plugin for Highlighting Hex, Rgb, Colors

I use a fork of css_color, vim-css-color which claims to fix a few of its shortcomings (mainly speed improvements).

Kind of late to the party, but I would mention that Colorizer is a good alternative to vim_css_color.

Especially for those who intend to use it for filetypes which the latter does not support; i.e. personal dotfiles which do not rely on Xresources.