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I was thinking something slimy or lots of grass at the front of the unit and have it all dead at the back but basing is not my forte.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/513055/5372921.page http://www.dakkadakka.com/dakkaforum/posts/preList/513055/5372921.page GMT
You could do just regular terrain, but have it rotting near the marines like an aura of decay and disease where they've stepped. Like what you've said, with bits of puss or smegma or whatever dripping in pools and spots. That's what I'll be going for when I finally get to do my Nurgle army. You could also have the ground already completely diseased, with pools of sludge and filth. Rancid, rotting flesh floating in them. Depending on how much detail you want to put into them.

I've seen some resin bases with dead bodies on them. I think they're supposed to be partially buried but you could easily do it up like their flesh has melted to liquid rot. I can't remember where I'd seen them, it may have been Secret Weapon. I had just Googled 120mm bases so I don't know if they come smaller.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/513055/5373250.page http://www.dakkadakka.com/dakkaforum/posts/preList/513055/5373250.page GMT
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Also, you can use the leftovers to feed the ild birds in your garden. Just don't scatter them too close to the bushes or sneaky cats will get the birds.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/513055/5374948.page http://www.dakkadakka.com/dakkaforum/posts/preList/513055/5374948.page GMT