1. Start with a white 2.5" x 3.5" card. Draw the angled outline of the building. Cut off the corners on the bottom left and top right.
2. Trace all the lines with a black Sharpie marker.
3. Fill in the building with markers. I really love the Stabilo brand that has just the right tips for coloring large or small. Place finished cards in 9 pocket trading card sleeves that you can find at Staples.