Script Summary: Everybody is disappointed by gmail's new UI. This small piece of script tries to colorize the new UI to make it a little bit easier to use.
1) The script highlights new emails in the mail list so that you can identify them at a glance.
2) The script highlights the header of each email in a mail thread, so that you can easily identify the beginning of each message.
Works with the *New UI* of gmail only. And works with color themes best.