I'd say Ion fury's got you covered there, heres a sheet of some of the foliage Ive put together for you:
shrub_niggurath.png
you can ick what you need, rotate it, flip it, cut it up and whathaveyou and then just scale it in the engine to get it all the right size in-game.
I've even included the shears so you can cut it up easier, lol!
all credit to cage, the original autor...
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