Capeanne,
I have been looking for bisque tiles and I know I saw some bisque chargers. You might check at local ceramics shops to see if they can get some for you and help you decorate then fire them.
The link below is just one of the places I found that sell chargers - I know nothing about them other than what I see on their site. This just shows that what you are looking for can be found.

Here is a link that might be useful: Bisque Imports