Trim each 6? sheet in half both ways to create four 3? squares.
Fold each square in half to make a triangle. Then fold in the sides to the center line to form a diamond shape.
On the “front” of the diamond, put glue and attach the next color in the rainbow to the two points as shown in the illustrator.
Continue gluing on the points until you come to the last one. Tuck the last color under the first color so that it overlaps, and glue as you have done for the other points.
Add another dot of glue on each flap so that it lays flat. Now hung the starts with string or attach them to your window using a tiny piece of tape.