Will Pinus parviflora, japanese white pine, make it in your area? There are quite a few blue cultivars of it, and it makes sort of a broadly conical form, up to about 50 ft tall. Or maybe limber pine, Pinus flexilis? I like 'Firmament', which is quite blue. There are also some very blue selections of P. strobus, eastern white pine-- another large one, but native to your area. Abies koreana might work, too, and it's also a smaller tree, with several blue forms. You might also want to look at Picea mariana, black spruce... several blue cultivars there, and if you look at seed-raised plants, you may be able to pull out a really blue one. Kay Lancaster kay@fern.com