I've seen something like this in Rome, where the church is decorated with the bones of deceased monks....but this one is just made of normal people who didn't fit in the cemetery anymore, thanks to the Black Plague...hmmm...
Link to the very descriptive article and lots of gruesome photos.
When does this type of thing become just plain voyeuristic and abuse of human remains? How would you feel if, in the after life, you knew people were paying to see your bones decorate some church in the Czech Republic??? How do you think your descendants would feel?
It's SO bizarre.