im collecting sea shells of various sizes to make keychains

i have two styles i wanna do

one where the figure is in a seashell, and another where the figure is holding an itty bitty sea shell

for the sitting on i wanna do a hippocampus and a sea serpent, but idk for the holding one (maybe a cat in a cute swimsuit lol)

pls suggest me some animals (marine or not) to use! ! thx

lol hopefully yall can understand tjis i think i got a little too hot outside rippp