I chose "no colour" for mine. Natural Ash.
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I originally set out to buy straight black but just couldn't shake the natural ash every time I looked.
As for pickguard changes, it will be your bass and only you that you have to please. Customise however makes you happiest.
Natural is the way to go. The am Elite is a kind of chameleon anyway, meant to do it all, so I feel like a neutral natrual works in any situation just like rest of the bass would.