A Second Grade lesson using concepts of line, color, and overlapping The contrast of the white Birch trees and the colorful Autumn leaves make them stand out in the picture. ① Begin your birch trees by drawing with a black oil pastel ② Then color in the trees using white oil pastel ③ Add some lines of different colors into the white trees to add extra interest. Don’t add too many ④ Paint in background using Primary colors only. Have fun mixing the colors to see what new colors they make!