Pretty much as as the title says.
So far, we don't know what clans really do, aside from a nametag. If you're part of, say, Robin Hood's Merry Men, or [RHM], your nameplate would show that on it.
But it'd also be cool if the clan leader could choose one shader that s/he owns and make it the Clan Shader, meaning that every member would always be able to choose that color scheme. Is your whole clan about to hit the Crucible or a raid? Match up in Robin Hood's green and browns to show your team spirit. Clans could earn special shaders or emblems as well.
Thoughts?
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I thought it was cool until my second thought. Don't think I want anyone else's Warlock to look like mines. Especially clan mates. Though special banners might be cool.