Highlight user's comments in blogs, so that it would be easier to distinguish between comments. However, the comments on an article ( if at all it is enabled) should not be highlighted.
This would be a good starting task for Pre-university students to start with. I'd love to mentor the students who wish to take this project up.
@MaroonPixel: Thanks! Please see https://www.mediawiki.org/wiki/Google_Code-in/Mentors for how to mentor and requirements.