Well... i liked your doodad modelss. But it uses Lava Cracks and Poison tiles which is okay for you.
But i'm just asking you an idea to make a separate model of the lava poison doodads to have "TerrainArt\Dungeon\Cave_Lava.blp" to make it similar to the OM being animated so that you, i or anyone possibly won't need the tiles from terrain palette window. I haven't tried your models since i saw them on the page (Like LavaRiver1.mdx, LavaRiver2.mdx, LavaWaterfall.mdx, PoisonedWaterBlock2.mdx (or PoisonedWaterBlock3.mdc), and PoisonedWaterfall2.mdx (Or PoisonedWaterfall3.mdx) with the regular lava and green lava tile textures). You get what i mean.
Sorry to bother you btw.