This got fixed by Thunderbird 31. Great!
See
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1347124/comments/5
** Changed in: thunderbird (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1004841
Title:
Thunderbird Icon set is broken (ugly, black and white icons)
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