Several vendors are selling cases for the Kyria. Splitkb.com sells several acrylic cases, for example.
However, if you have your own cool case idea or would like to use materials that I won't, you can make your own case! The files for the Kyria cases are available on Github.
Have you made your own case for the Kyria and would you like to have it featured in the splitkb repository? Send a mail to firstname.lastname@example.org and I can link it on the Github repository or host it for others to use!