Some years back I collaborated with the Czech artist Lea Ravotti on the book Signs and Mysteries: Revealing Ancient Christian Symbols. Readers of that book might be interested in this title just out by Anastasia Lazaridou: Transition to Christianity: Art of Late Antiquity, 3rd-7th Century AD.
If you don’t know Signs and Mysteries, though, do check it out, if only for Lea’s artwork! (If I hadn’t given up punning for Lent, I would have said czech it out. Isn’t that prague-ress? … Oh, there I go again, back to Ash Wednesday.)