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Vioorange Warm
Warm, cozy, bright theme in violet and orange, ideal for winter or autumn.
Screenshots: https://imgur.com/NdKQA43 | https://imgur.com/uXtZpPw

Classic BB Colors
Calm and simple, bright theme in classic blue and beige colors.
Screenshots: https://imgur.com/AWjqqfe | https://imgur.com/75u8TvJ

Pistachio Ocean
Light and fresh, calming theme in pistachio and bright blue colors - not only for medics.
Screenshots: https://imgur.com/0hNFPjY | https://imgur.com/0Rma4Mn

Irish Coffee
Elegant and mellow theme for true gentlemen in different shades of brown.
Screenshots: https://imgur.com/UdyJoLr | https://imgur.com/wvkTQuN

Retro Cyborg
A distinctive theme referring to retro arcade games in turquoise and blueviolet.
Screenshots: https://imgur.com/mGno8eL | https://imgur.com/i5brkRR

Greeny Lemon
A refreshing theme with a delicate citrus flavor in yellow and green.
Screenshots: https://imgur.com/QKe1FZQ | https://imgur.com/aBVVKtX

Autumn Blush
A warm theme of a wood changing its colors, in red, orange and khaki.
Screenshots: https://imgur.com/J8X8nNp | https://imgur.com/u1PnUqU

Raspberry Garden
Sweet nad fruity theme in crimson and green, not only for summer.
Screenshots: https://imgur.com/o7D4ft7 | https://imgur.com/WkeDhNE

Cloudy Sky
A calm theme in different shades of blue for those with their heads in the clouds.
Screenshots: https://imgur.com/cJqEzhf | https://imgur.com/tbuqgGi

MintGreen Dark Soft
This theme matches well with LinuxMint and Cinnamon Theme.
Use an add-on like Darko to darken the message body.
Originally written for Firefox.
Thanks to calvinchd at calch.themes.thunderbird.net for original Gruvbox Dark.
Tested up to v128.

Blurple
Blurple: A calming blend of blue and purple.
Start blurpmaxxing today.

Gruvbox Dark Thunderbird
Gruvbox dark theme for Thunderbird. Originally written for Firefox. Using https://github.com/morhetz/gruvbox color palette.
Check out this theme for Firefox https://addons.mozilla.org/en-US/firefox/addon/gruvbox-dark-theme/
To create your own collections, you must have a Mozilla Add-ons account.