Ok I've created some metas, here's the wireframe, the five on the left are ungrouped, the five on the right are separated into two groups. the 5th ball stuck on the side of each group is a negative meta created using shift click. I've used different textures on the metas because it can create some interesting effects

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.