A hexagonal Escher-style tessellation of seahorses from well-known tessellation artist Bruce Bilney of Australia
This design has also been turned into a tessellation on the surface of the 12-sided, pentagon-based Platonic solid known as a dodecahedron. You can see, download, decorate, and assemble that seahorse tessellation papercraft at the far end of this link.

Bruce Bilney's Escher-style tessellation art, seahorse theme

Heesch type = C6C6C6C6C6C6

You can see much more of Bruce Bilney's tessellation art at his website, Ozzigami.com.au