On: What’s the best thumbnail for this page?

[Swizec]

Even the best of articles need to be broken up visually otherwise they are difficult to read.

Anecdotal proof: all written publications ever.

[kenneth → Swizec]

Sure, but that can be done with good layout and typography, or tasteful illustrations (à-la New Yorker). Simply using bad filler stock images is a really bad way to go about this.