There is nothing quite like visiting a farm for inspiration (and delicious, fresh produce!). I particularly enjoy trekking out to Snoqualmie Valley, and found this handy list of farms that are open to the public:
http://www.snoqualmievalleytourism.com/images/Snoq%20Valley%20Farms%20Open%20to%20Public.pdf
I called the recording at Bybee Nims Farms yesterday, and they said the blueberry harvest will begin at the end of July this year. Can't wait!