Pied Beauty=Particolored beauty: having patches or sections of more than one color.
The author starts out by describing the many colors that are in one pattern or design in nature, using the colors from others:
"rose moles" dotted on "trout that swim"
"skies of couple olor as a brinded cow"
"Fresh firecoal chestnut falls"
Then the author describes the landscape, which reminds one of the aerial view of land from a plane, where its different colors are sectioned by the way each piece of land was worked
The author then moves beyond the visual meaning of "pied beauty" and includes the great assortment of "all trades", and then "all things counter, original, spare, strange".
The authors language shows how the author sees one thing as an ensemble of others, and how the beauty is not only visual but is found in every different aspect of life.