Sea Shell

My rough shell comes from the sea
Where it is as salty as salty can be
Soft shells that shimmer in the sunshine
At the sandy, sunny coastline
It is as grey and salty as the rocks
You will them at any docks
Always cold, sometimes wet
If I lost it I woud fret
It was a house for a hermit-crab
That sat all day on a rock-slab
But then I found it on the shore
And used it for sandcastles galore
My shell that comes from the deep blue sea
The perfect sea shell for me!