I was playing with the idea of making a ceramic sporran cantle, but it just doesn't quite seem right; everything is done with metal etc.
Possibly a cap badge or kilt pin might work out if the glaze is very carefully controled. I work with a bunch of people who dry brush ceramics, and that might also be another approach.

I don't know enough about the knife handles and blades to know if the ceramic would work for a whole handle. Others have used the polyceramic for handles and that type of thing, though.