Pteropods are the ocean's poster boys for ocean acidification. (Read about why here in this thing I wrote.)
There are sculpture of pteropods at the Smithsonian Institution. Read about that here.
And here's a comparison of a sculpture and a live version. The live version is definitely better, but the artist did a good job in capturing the essence of the creature.
Sculpture of Limacina helicina:
Picture of Limacina helicina: