We get a lot of misc and other items from the treasure hunting events that have a lot of potential. Here are my ideas for the decors they could be crafted into.

-Seaweed:
Seaweed Raft (Background) (a tangle of seaweed that the lion stands on, stranded out at sea. Crafted from 30x Seaweed)
Seaweed piles (lumps of seaweed around your lion. A foreground and background variant. Crafted from 15x seaweed.)

-Parrot skeleton:
Macaw (a random Macaw variant from a pool that sits on your lions shoulder. Works like the chameleon decors. Crafted from 10x parrots skeletons and 5x lovebird plumage)

-Driftwood:

-Coral piece:

-Amber:

-Sea Urchin:
Sea Urchin pile
Urchin Growth

-Rusty Iron Grenade:
Grenade pile ( a pile of grenades off to the side, crafted from 10x grenades)
Gunpowder (piles of the black powder off to the side, crafted from 30x grenades)
Grenade (a grenade held in the lions mouth, unlit. Multiple versions for different chin colors. Crafted from 10x grenades)