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Of course the obvious option is to just build it up with green stuff, but I want something that looks a bit cooler. Any suggestions?
Well, they all come with Extended Carapace bits on their sprues, but aside from greenstuff, platic card works well. You can find it at most hobby stores and you just cut it to the shape you want. Some are even thin enough that holding them in a shape under a heat lamp will allow you to shape them a bit.
Another option is to get decorative seashells (any craft store) and glue them onto the nids, like barnacles on a ship.
Gyauayuayuayua! Ja! Ve vill crush da little girly men in deir little girl men awrmor! Ve vill see owur enemies driven befowur us, und hear da lahmentaytions of deir wemen. Und from owur home planet, de stayte uf Califowurnia, ve vill lawunch owur mighty offensive. Even if you kill us, ve'll be bach!! Gyauayauyauyauyau!
-Arnoldunit Schwarzenecronegger; when questioned about the impending doom he would rain down upon the heads of his doomed enemies.
i use different trading card game cards i.e. magic the gathering, yu-gi-oh! warhammer 40k tcg ect...
you just cut it the way you like it and then prime it.