Red, green, and blue
tool labs (old)
Derived from Community Logo
Unused sister project logo proposals
Wikimedia Strategic Planning
From Wikimedia Incubator/logo.
From Wikibooks/Logo/Archive 1.
From Wikidata/Logo voting
More sister project alternatives
Committees, Chapters, Usergroups, WikiProjects, Raccoon Lodges
Why don't we use these colors everywhere?
It was discussed during the 2006 Wiktionary logo vote, and was determined then, that having all the logos use the same color schemes, would be confusing; see example at w:de:Benutzer:Julian~dewiki#Test on logos. See also, these discussions (Discussion on the logo votes#The Color Complication and Talk:Wiktionary/logo/archive-vote-4#Changing colors), in particular this comment: "the only thing we can do is to ensure that newly chosen logos harmonize [with] the others but don't look all the same". See also Logo#Logo guidelines: "It must be substantially different from the other project logos but still harmonize with the others."