Layout 6 cards in a star type shape. Do 2 sets of these. Glue all cards in position.
Lay one set on the other and glue together. Stick some buttons in the middle to cover the hole.
Add a large button or embellishment to the middle of the buttons.
Stick on some jewels around the edge and spray the whole thing with glitter spray.
Stick the whole thing to some card and some coordinating fabric (unless you like the back of your cards in which case leave it as it is). Use a rectangle of felt to stick the whole thing to the hairband.