Here is a terrific Youtube video showing Studio Ghibli background artist extrordinaire Kazuo Oga demonstrate his skills. The song is really terrific (I wonder who it is?), courtesy of the person who, ahem, "assembled" this video.
As soon as I can afford it, I'm definitely buying the Kazuo Oga Blu-Ray. His Ghibli backgrounds will look spectacular in 1080p, and heaven only knows how long we'll wait for the films to appear on BD.