This is the first version of it: https://github.com/bridean/color-labels-for-posts-and-pages.

A while ago I thought, it’d be really useful if I could navigate through WordPress pages, posts that are color-coded (coloring the whole page/post menu item HTML element) so I could find certain ones quicker. I started looking around for a plugin that could do this and I couldn’t find one. I searched again this spring, with various keywords, key phrases and I still couldn’t find one. So, I decided to go forward with developing & designing such a plugin and did my research on what’s required of a WordPress plugin. I’m working on some finishing touches before I submit it to the WordPress.org plugin directory. Hopefully they’ll accept it & I’m considering making a premium version with many other features I have in mind.

If you’d like to check it out, go to the link above.