Jane Smiley's new novel, Some Luck (out in October), is the clearest distillation of the trend: cornfield, broad blue sky, barn.
Another cornfield, another clear-blue sky: Flight 232 (out in July).
More fields—not corn this time: The Road Back to Sweetgrass (September).
A more crowded cover, Keeping the Bees (paperback issued this past May), keeps the green-field-blue-sky combo.
And here's the parenting book version: Freeing Your Child From Anxiety (reissued in July).