Autumn's fiery-colored leaves have fallen, so now let's look for more subtle beauty in trees and shrubs. Like a developing photographic image, the textures and colors of bark come into view in the increasingly stark winter landscape. Paper birch isn't the only tree with bark worth looking at. COLORFUL BARK Take a look at the spectrum of colors in bark. There are reds ranging from the fire-engine red of the shrubby redosier dogwood to the coppery reddish-brown of the Nanking cherry to the dulled red-brown of Cryptomeria. Individual trees of river birch each have their own bark hue, some cinnamon-brown…