This "Frost Wyrm" from the Reaper "Bones" range arrived in the post today. I bought it for a snake god in a HOTT army, but as I put it down next to some Tyranids I had left lying around, I couldn't help but notice that it matches the style and mass of them pretty well too. It might actually do double duty as a serpentine close combat Bio-Titan, perhaps from the Trygon genus. I'd need to do something with the eyes, but I was going to do that anyway. Worth checking out if you're for one of the larger style Tyranid Bio-Titans I think! Also cheap!