I saw one just yesterday.
Walking through a store, came across a section of a shelf which had candles in tall glass containers. And so help me, I had a vision of the Virgin Mary (was she a virgin the entire marriage?) on the sides of those candles!
It was enough to scare the dickens out of me. An entire bank of Marys miraculously appearing from out of nowhere in of all places the candle section.
I was more than a little rattled. As I left the place I saw a burning bush attended by bearded, ragged folks resting in the desert, though that may have been some Mexican landscapers.
Arf