Spiny Sea Urchin
I forgot to mention that Thomas Heatherwick's B of the Bang (second post down) is supposed to represent the flash of a starting pistol. It looks nothing like that to me. "Spiny sea urchin" was my first thought. Here's an excellent illustration of a Hawaiian species to show you what I mean. What can you do with an artist who doesn't know a muzzle flash from a spiny sea urchin? Sue him for £2m when his spines fall off!