This script adds various classes to the "talk" tab, to style it based on the status of the talk page:
You can then add CSS rules to apply various visible changes to the different types of links. The default rules are available in User:Anomie/talklink.css.
To use the script, add the following to your common.js.
importScript('User:Anomie/talklink.js'); // Linkback: [[User:Anomie/talklink.js]]
importStylesheet('User:Anomie/talklink.css'); // Linkback: [[User:Anomie/talklink.css]]
Note that this script has only been extensively tested on Monobook.
The line for talklink.css may be omitted, if you would rather add custom CSS rules to your common.css.
Please note that the line for talklink.css does not go in your common.css, it goes in your common.js along with the other lines. Alternatively, you can copy the contentsofUser:Anomie/talklink.css into your common.css and customize the rules however you would like.