Are all verbs blue ?
https://addons.mozilla.org/en-US/firefox/addon/colorify/
It's parsing any webpage, and coloring words based on their Part-Of-Speech tags.
The idea behind is that if we let the computer pre-parse the text for us, it should incur less mental fatigue, and help visualize the structure of sentences therefore improving our reading comprehension.
The question is how universal can we make this color-mapping ?