Reddit reviews Heavenly Bodies: Cult Treasures and Spectacular Saints from the Catacombs

I don't know who Toby de Silva is, but I do know that Paul Koudounaris published an amazing book on this: Heavenly Bodies.

I'm glad you asked that. I have a couple of wonderful books with photos.

http://www.amazon.co.uk/Heavenly-Bodies-Treasures-Spectacular-Catacombs/dp/0500251959/

http://www.amazon.co.uk/The-Empire-Death-Cultural-Ossuaries/dp/0500251789/ref=pd_bxgy_b_img_y

The best ones I have seen myself were in Italy and The Czech Republic.

Excuse the shitty site, but it has some detail about the purported history of the skull, which is venerated as that of Mary Magdalene:

http://www.magdalenepublishing.org/about/

http://www.amazon.com/Heavenly-Bodies-Treasures-Spectacular-Catacombs/dp/0500251959/ref=sr_1_1?ie=UTF8&qid=1416811907&sr=8-1&keywords=heavenly+bodies

The inspiration we used was from the catacomb saints from the book Heavenly Bodies. The skeletons ordained in jewels were pulled from the catacombs, so as you can imagine they're old and jacked.

http://www.amazon.com/gp/aw/d/0500251959

For those interested, there was a book published a little while ago with full-colour photos of these skeletons. http://www.amazon.com/Heavenly-Bodies-Treasures-Spectacular-Catacombs/dp/0500251959