Take the ruler and the pencil. Draw strips at the back of the cardboard. Cut the strips. Flatten the end of the toothpick by cutting the tip. Spread some glue on the cardboard and fold it around the toothpick, so as to get some kind of a little flag. Make sure the flag is glued to the flattened side of the toothpick. Press both sides onto each other firmly. Then let the small flags dry thoroughly. Cut a triangle in the flags and ... it's ready!
Tip : if you want, you can write or glue something funny on it.