Some CSS files designed for use in Stylish in thunderbird to change the look and feel of thunderbird itself.
mainui.css is designed for a general refresh of the Thunderbird UI. maniui.css was based off http://userstyles.org/styles/76739/fedora-18-thunderbird-tweaks by andyfitz.
conversations.css is designed to enhance the UI when the Thunderbird conversations plugin is enabled:
https://addons.mozilla.org/en-us/thunderbird/addon/gmail-conversation-view/?src=ss
These CSS files are designed to be used in Thunderbird with the Stylish plugin:
https://addons.mozilla.org/en-us/thunderbird/addon/stylish/
To use, just create a new style with stylish, and add the CSS to it. Repeat this for each of the CSS files in this repo.