"s" is for...

shadow on a s is for sunny day!

slinky!

scooter (or as bennett says "cooter")

swords (along with a s is for sly smile)

stretch the slinky (that is now no longer a s is for slinky)

sister story time...s is for so sweet!

super silly small group friends (s is for sorry friends for s is for sharing)

sleep tight in his s is for super man jammies!