Heather Ann, a Dallas costume/prosthetics maker, created these $110 snail shell helmets (tentacles not currently included).
They look like they're strictly costume items, which is a pity, because they would rock as real-world bike helmets!
Snail shell helmet [High Noon Creations/Etsy]
Snail Shell Helmets Are Cute AF And They Protect Your Head
[Brittany High/Incredible Things]
(via Crazy Abalone)