Summarize the following:
Most flags are either rectangular or square. Your flag doesn't have to be rectangular, but you should stick to simple shapes that are easy to see from a distance. For example, Nepal’s flag is made of two overlapping triangles.  Consider what you will be using your flag for. A triangle will work well for a pennant flat, while a rectangle will work for a sports flag. In general, rectangles are the easiest shape to work with because they give you the most space to create your design on. Some of the most common flag designs are bicolors, tricolors, and quarters, or use stripes, panels, and borders. The flag can also be a solid color with a unique symbol in the center. Alternatively, you can place a rectangle in the upper left hand corner called a canton (like on the American flag) that includes a symbol.  You could create a symmetrical flag, like Japan's flag, or an asymmetrical flag, like Norway's flag. Look at flags for other countries and sports teams to get ideas. If you really want a detailed flag, take a look at some of the state and community flags. As a general rule, you should only use 2 to 3 colors in your flag design. If you use more they can be hard to distinguish. The most common colors found on flags are black, blue, green, red, white, and yellow. You can use light and dark colors to create contrast.  You do not need to stick to the most popular colors. Instead, choose a color that symbolizes the place or organization your flag represents. Avoid colors that are too similar to each other, such as red and orange or navy and dark purple. They won't stand out as well.

Summary:
Choose the shape for your flag. Choose a simple design. Use 2 to 3 colors.