Haiku Party

I am at a teaching conference right now (which would explain my not checking in), but my sister's last haiku inspired me to create a series of four. Can you guess how they are related?

Silken, slippery

Swishing bubbles, drifting through

Its treasure chest

Black-eyed, waiting for

Children stepping off the bus

In lonely silence

Curled up soft and warm

Eyes golden, mind drifting off

The sharp smell of fish

Soft and fragile, but

Given cause, all sharp as pain

Not easy to kill

Guess one, and you'll probably be able to figure them all out. I head home from my conference tomorrow, so I'll soon be home free, and able to write. Leave me a message with your guesses, and kudos to whoever can figure out all four!