Mostly Crystal is a theme for Thunderbird 2.0 "mostly" from the colorful Crystal SVG (for Linux) icon set designed by Everaldo and includes icons in their original form plus custom-edited composites of the originals.
Choose from a variety of userChrome.css to customize the appearance of your theme.
Screenshots
Main window with small icons

By default the throbber is Circular inside the menubar and a Penguin when placed outside the menubar.
You can apply userChrome.css options to override the default.

Other background options:

Compose Message

Address Book

Error Console

Options Window
Go to page for
Mostly Crystal theme
for Thunderbird
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Go to page for
Program-window Icons

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Go to page for
help with Menuitem Icons

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Go to page for
userChrome.css
customizations
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Update info
Last theme update: 29 Nov 2007
options updated: 29 Nov 2007
See for a detailed list of recent changes.
Developer's notes
If this theme breaks on a nightly build, support will not be provided for problems.
This theme is not backward-compatible with Thunderbird versions prior to 2.0.
If you are looking for this theme at addons.mozilla.org read this.
If you are using a third-party release I take no responsibility for problems. Look here for more details.
Please see the FAQ for additional information.
If you wish to report a problem, use the Contact Form located here.
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Donate
If you like this theme and wish to show your appreciation in some way, please help support the American Society for the Prevention of Cruelty to Animals (ASPCA) by making a small donation.
Checks should be made payable to "ASPCA" and mailed to this address:
ASPCA
424 East 92nd Street
New York, NY 10128-6804
Or you may make a donation online at:
www.aspca.org
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