On a covered cake board, place a row of five cupcakes for top of bus. Arrange six cupcakes each in the second and third rows. Follow with a row of five cupcakes.
Tint 2-1/2 cups vanilla frosting; carefully spread over cupcakes.
Spread vanilla frosting over cupcakes as desired for windows. Place a chocolate wafer on each tire; attach a miniature sandwich cookie hubcap with frosting.
Tint a small amount of vanilla frosting black and a small amount red; set aside. Pipe outlines and desired details onto bus with black frosting.
Placer a vanilla wafer in each window. Tint remaining frosting as desired. Pipe faces on vanilla wafers; pipe hair, hats and shirts as desired.
Spread red frosting onto cupcakes for stop sign and taillights. Fill in headlights with coarse sugar.