Rated 5 out of 5 stars

Great theme that fully skins TB 3.1 + Lightning. It also give the the menus nice little icons and will give commonly used addons like eXpunge an Nuvola icon. Gives fun but still professional look.

The only thing more I could ask is for it to give Shadow912's buttons the Next and Previous icons. (But I'm not sure if this need programed by the theme maker or the button maker^^;)
https://addons.mozilla.org/en-US/thunderbird/addon/159030

Looks great and matches Task Coach which also uses Nuvola icons. Looks nice with Firefox as well.

This review is for a previous version of the add-on (1.9.1).