Actually, Neil, i was also thinking of what they might look like AFTER all that. Somehow, i think there should still be more subtle colors and patterns in the hills after the harvest. Not exactly sure what I'm visualizing in my addled little brain, but it might be interesting to take a look at the area anyhow. Know what i mean?
I figure, if it's a bust, I can always head on south to the redrock area of the South West for a sure thing.
There are always opportunities for photographs. Where there is winter wheat planted you will have the green versus harvested fields, however, fall is just a different time.
If you want to try something different. Just west of the Palouse is the area impacted by the Great Floods. It is a VERY interesting landscape and hardly ever photographed from a fine art perspective.
I have various posts on this area: http://usbackroads.blogspot.com/2010/09/swanson-lakes-wildlife-area-odessa.html
AND here is the background information on how the area was created: http://usbackroads.blogspot.com/2010/04/seep-lakes-othello-washington.html
This blog on the ice age floods also has pictures: http://iceagefloods.blogspot.com/
It is a much more interesting landscape than the Palouse and is just west of the area. Hardly anybody has done any photography that does it justice.
My own wanderings in the area have been focused on fishing and hunting rather than photography. The light in September and early October is perfect for photography.
Do click on the iceagefloods blogspot.com above and check out his photographs. They are "science" photos. But you will get the drift.
Give it a try and if you find some guy wandering around with a shotgun and a German Longhair Pointer or fishing gear stop and say hi. I would love to see photo's of this area from other photographers.