Make them different - use the GW model as a single one, of course - but also make them from Tyranids, Daemon princes, maybe out of a Wraithlord! Looking at the GW site, these Warhammer kits look like they hold a ton of conversion possibilities: Lizardmen Ripperdactyls, the Dark Elf War Hydra, Beastmen Minotaurs, the creatures holding the Chaos Warshrine, and the Chaos Lord on Manticore. If it's small enough, the new Wood Elf Treeman might work out.
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