Underwater Mermaid Graveyard

Have been thinking about what to do with the frontyard. It was suggested that an underwater mermaid graveyard might be awesome. I'm beginning to agree. It would mean a lot of work now with creating flat props to dig into the yard. I'm also thinking some large rock features. Maybe pvc structures with balloons taped to them, covered in paper mache. Just a first thought...need to figure out if there's an easier way.

I'm also thinking of creating several mermaid corpses. Oriental trading has blucky skeletons for ~$27, which I thinking I can modify for mermaid use, as well as make them a little more...corpsy.

Also, clearly, a five year old could trump my drawing skills.