My next project is so mysterious I don't even know what it is. There are a couple of candidates though, and I am currently building generic assets and doing some tests. Find the Human Experiments thread in the Sculptris forum at ZBrushCentral (be good if you could post links here, eh).
Actually they're the easy part... just deformed refractive spheres. Unless you mean the smaller bubbles, which are hypervoxel particles.