For my vote on the most effective is probably going to agree on the simpler but quite effective kitbash by daisyduke.
And second vote on the most inventive to gunslingers necromancer. One question on that model how have you managed to get those rocks in place? Lots of pinning? Or is this more a display peice not needing of much strength?
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The rocks actually come like that, they are from the High elf mage kit.
A great piece which I have dying to use for ages.