Finding cover images for the podcast and SpecFaith article proved a bit difficult.
You see, Crossway first published Peretti’s book in 1986. At that time no one was uploading high-res cover art to the internet. Ultimately I had to scan my own paperback copy (autographed by Peretti himself) with frayed edges and all.
And since the internet, the publisher(s) has redesigned the cover once or twice:
All these work to some degree. But the all-time best cover for This Present Darkness is this Russian-language edition, which according to Goodreads was published in 2011.