I don't think it would be too far out of line to suggest John Rhys-Davies as Gimli's dad Gloin, eh? On a slightly creepier note, what if they used Orlando Bloom as Legolas' dad Thranduil, too? 
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“…she laid herself to rest upon Cerin Amroth; and there is her green grave, until the world is changed, and all the days of her life are utterly forgotten by men that come after, and elanor and niphredil bloom no more east of the Sea.”
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