One day in advance, decorate house panels. Work one color sugar at a time. Apply sugar to icing and shake off excess into jelly roll pan. Roof: Use white icing to pipe vertical lines on roof panels. Repeat for each color on roof. Trees: Outline and fill in with white icing. Cover with dark green sugar, shake off excess. Pipe dots and attach jumbo nonpareils. House front: Spatula ice area under front peak with icing. Add jumbo nonpareils. Use white icing to outline door and pipe e-motion around front door; pipe dot doorknob. All windows: Fill in windows on sides and back panels. Cover in light green sugar, shake off excess. Use white icing to outline windows and attach jumbo nonpareils.