To make these pins, all you need is fake flower lei like the one shown above, thread, needle, scissors, buttons and pin backs. The pin backs we used were from a thrift store, and safety pins would work too. The buttons were from my button stash. So the only thing we bought new was the thread.
I made one, and was pretty careful about my stitching. I stacked the flowers and tied a knot in the thread and pulled put it through the top of the flowers, around the pin back, back up through the flowers, then added the button. Sewed it carefully in place then hid the knot between the button and flowers. TG decided that the thread ends wouldn't matter very much since it was for her jacket and knotted on the back of the flower.
There are still a lot of flowers left. I'm planning to use smaller buttons and sew them to some hair pins (the U shaped ones) for myself and TG is thinking of other things she can use them on. So far, we've talked about purses and miniature fairy dolls.