Is there any resource with the Marks for all 10 Companies of the White Scars?

Second, GW paints White Scars as both White with light blue in the crevices and White with brown in the crevices. Which is more "accurate"? I'm aware that this is pretty much entirely subjective...

Lastly, how fluffy are Centurions in a White Scars army? I got a box because I'm in the minority that like them. Dreadnoughts where at first absent from White Scars fluff because they loathe sticking a battle brother bear his death to the Sarcophagus, but the new Codex now says they are just rare for that very reason and are used only when the need merits them.

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