Glossy Fox

Created this Glossy Design in Photoshop CS4

ASUS - Republic of Gamers V2

Magic winter cat

Magic cat eyes feline

CarbonFox

Carbon Fox

Dark Fox No Logo

Edit of randomaster Dark Fox theme to remove logo.

Mail Delivery 4K (2009 Alt)

Mail Delivery 4K (2009 Alt) theme for Thunderbird 100+ and 4K monitors.

Friul

Theme with the official Friulian Flag.

The Hunting of the Snark 2

Chocolate brown colored theme with a detail from an Illustration by Henry Holiday to Lewis Carroll's "The Hunting of the Snark"

Thunderbird Daily Suave

Based on the "Thunderbird Suave" theme by aramaicus.

Mail Delivery 4K (2023)

Mail Delivery 4K (2023) theme for Thunderbird 100+ and 4K monitors.

yahane_pattern

yahane_pattern, BY: HEKISU1

Mail Delivery 4K (Grey)

Mail Delivery 4K (Grey) theme for Thunderbird 100+ and 4K monitors.

Space - wonderful world

space, wonderful world, stars, mathematic

Asus ROG Leather Small Badge

Asus ROG inspired theme with smaller badge to better suit some resolutions

Mail Delivery 4K (2004)

Mail Delivery 4K (2004) theme for Thunderbird 100+ and 4K monitors.

summersmile

Summersmile adds a lively flair to Thunderbird with a sunny yellow background, playful smiley graphics, and a "sunshine and smiles" theme that refreshes your email experience.

irasutoya01

Thunderbird 78 以降用に使えるテーマを練習用に作ってみました。
Very simple theme, which uses only public domain illustrations.

New Dark Bird

A Thunderbird theme with the new Thunderbird Logo.

Breeze (Plasma 5) Arch Linux

Breeze (Plasma 5) + logo of Arch Linux

Cat Collage

My cat Beeper can now delightfully viewed on Thunderbird.