Ok, I am completely freaked out, I am currently in the process of making almost exactly the same thing! I have been making the tiles in my ceramics class - they have been underglazed and hopefully had their first firing this week, on monday I will be putting a second glaze on to highlight the carved letters.
found this picture on my camera that shows the process of creating the tiles (I have two extra blanks)
I am going to do a patchwork board
I guess great minds think alike eh?