It's my image of wildflowers and Mt. Hood that I took August of 2009 while hiking the Timberline Trail (around the perimeter of Mt. Hood). It looks great on the cover!
If you'd like to see more images from that trip, here are the links-
Day 1 photos
Day 2 photos
Day 3 photos
(I still need to blog day 4 photos... someday!)
Here is the original un-cropped cover image-