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.

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"

New Dark Bird

A Thunderbird theme with the new Thunderbird Logo.

Dark Space Thème 9MKR

Dark Space Thème 9MKR est un thème de couleur sombre avec une image de l'espace.

Cat Collage

My cat Beeper can now delightfully viewed on Thunderbird.

yahane_pattern

yahane_pattern, BY: HEKISU1

Illidan World of Warcraft

World of Warcraft Illidan the Burning Crusade Wrath of the lick king

dark myth

Asus ROG Leather Small Badge

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

Mail Delivery 4K (Red)

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

Mail Delivery 4K (2009)

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

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.