Escher did many polyhedra studies. I was going to compile a list but George Hart has already done a good job: [link]

Hart's page displays Escher image "Stars".  "Stars" has two chameleon lizards crawling about in a compound of three octahedra as well as many other polyhedra floating in space, including all five Platonic solids.

Some of my personal favorites:

Gravity. The small stellated dodecahedron is a very handsome solid and I saw it for the first time in this print. I like the twelve monsters too.

Double Planetoid. The tetrahedron is self dual and Escher made a wonderful image of dual tetrahedra where one tetrahedron is a city planetoid and the other is a wilderness planetoid.

Flatworms. just as squares, triangles and other polygons can cover and divide a plane, cubes, octahedra/tetrahedra and other polyhedra can cover and divide space. Flatworms was the first time I've seen a structure built from something other than the conventional rectangular bricks. In some circles these space filling polyhedra are called honeycombs.

Now there is a Deviant Art group devoted to polyhedra. I invite everyone to take a look at the Polyhedronists [link] . As of this writing the group's about two weeks old but there is already a lot of good stuff on it.

Regards,

Hop David