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Night Brushed Metal - XP
Slightly darker (Night) version of original Brushed Metal theme for Firefox on XP
Nu-grey-theme
A simple grey theme for Thunderbird. A solid colour hex #ccc background which may help reduce eye-strain.
Numix Blue (dark)
Numix background with some blue accents, optimized for use with dark OS themes
old dark pink
Pink Pink Pink Pink Pink
Pure White Marble
To create your own collections, you must have a Mozilla Add-ons account.