In 'Code::Blocks' you can go to Settings > Editor... and select the font option at the top under general settings... You can change the colour there as well as the font and style.
EDIT: The only thing is there are certain parts of the code that automatically change colour, and the includes are normally green. Whether this will change also, i do not know.
You may have to do it with no projects open, then create a new one. I am not sure though as I have not changed it myself, i just know the feature is there to allow it. If all else fails maybe they have a manual or some sort of guide on their website.
You need to set the color/font of each type of word (keywords, predecessor directives, literals, etc) individually in Code::Blocks. This is done in the syntax highlighting section of Settings -> Editor.