Fairy and mermaid sketches

I've started sketching fantasy again. I need fantasy in my life and my guess is I'm not the only one. My concepts came from watching the Marvelous Misadventures of Flapjack with the kids. There have got to be a lot of human bones at the bottom of the sea right? Remember that seen in Disney's The Little Mermaid in Ariel's grotto with all the human stuff? Where were the human bones? My mermaid concept is that mercreatures use human bones and skulls for all kinds of things in their world like building material, jewelry, furniture, you get the picture. 

That got me thinking about fairies. Fairies are really outdoor creatures so wouldn't they be more tough, even warrior like? They would use bits of bones, wood, rock and feathers for their needs. Not to mention clay and mud to help with the glare of the sun and sunscreen!