Cut your poster board to your desired dimensions. For example, most precut poster board comes in sizes 22 inches by 28 inches. However, you can get larger pieces and trim them down to larger sizes.
Divide your poster board into four equal sections by drawing a line right down the middle of the poster board and across it horizontally in the exact middle, using a pencil and ruler.
Label each of your four sections. For example, you could label them after the four seasons or after four different fashion styles you like such as classic, punk, goth and emo.
Flip through fashion magazines and find looks to fit each of your four categories. Cut them out, trimming around the neatly.
Experiment with arranging all your cutouts around the different sections. Once you're satisfied, glue each one in place. Go over all of your pencil lines and letters in marker.