Nothing Indeed!

readmorewikipedia:

Anthropodermic bibliopegy is the practice of binding books in human skin. Though uncommon in modern times, the technique dates back to at least the 17th century.

The libraries of many Ivy League universities include one or more samples of anthropodermic bibliopegy.

I once met a man who had done this. He was a professional bookmaker who had been commissioned by a man to create a book showcasing his tattoos. The cover of the book was the skin from the mans back (once he had died) showing his largest tattoo. True story.