The examples above are my own attempts at cat ornament
design.  Three of these were made from the polymer clay
called
Sculpey.   Artists and Crafters must, as in all fields
of endeavor, keep abreast of the changes in available
materials and new techniques.   When I graduated from art
school there was no such thing as polymer clay.  We used
the good old fashion kind that was dug out of the ground.  
Some of the true artisans actually went out and dug their
own.  I know polymer will never replace the "real" clay but
it has been a marvel to those who just want to model small
objects.  No mess and it can be "fired" to a rock hard,
waterproof end product using a simple household oven.   

I found that there is a weight factor to consider when
using clay for Christmas ornaments.   The "cat nipped cat"
was made smaller and much thinner so its end weight isn't
that bad, but the Cheshire Cat, who is about the size of an
adult hand and as thick, is extremely heavy and needs a
branch under him to support his weight.  All my cats are
done in bas-relief or are only one-sided or half sculptures.  

In the case of the angel ornament,  I sculpted the original  
cat with the same polymer clay and then made a silicone
mold from it.  I then used a Fast-Cast Polyurethane for the
end product.  It was a nice material.  It was relatively light
weight, waterproof, durable and could be drilled, sanded
or painted.  It was really quiet a successful project if you
are interested in producing multiples.  

If you haven't dabbled in clay, I highly recommend the
polymer kind  for its versatility, cleanliness and
convenience.