Divine Mercy Images
If you look just about half-way down my profile page, there's a picture of a charcoal and graphite crucifixion sketch I did a few years ago.
As you'll note it's completely monochromatic. I did it on a small peice of drawing paper, which I keep propped up against a radio on my night stand. A few months ago I snapped a picture of it on my phone to send to a friend. When I looked at the image on my phone it looked like this:
Being intimately familiar with the drawing, from the time I first rendered it, and looking at it every day and night, I was initially stunned by the obvious reddish tint around the wound in the side. For a few moments it gave me pause, and made me reflect on the sufferings of Christ. Then, I looked about and noted that the red was merely the result of how the reading lamp above the drawing was reflecting off a red candle in the foreground, and then bouncing against the silvery charcoal in that area of the drawing.
Certainly not a capital "M" "Miracle" in the traditional understanding of the word, but in my mind, no less an indicator of how God is present, and at work, in the very smallest aspects of our lives and activities.