Sort through thread spools and lay out on sides of cork board as they will be placed when glued. I arranged them to have the colors flow, but they could also be random.
Stitch through buttons with floss. Knot in back side of button. Arrange in order with the thread spools. Set aside 5 buttons.
Using a hot glue gun, glue thread spools, and buttons in place on the frame of the cork board. (the frame need not be painted)
Hot glue the 5 buttons that you have set aside to the top of the thumb tacks with hot glue. To do this, turn the button upside down, apply a drop of hot glue and push the thumb tack upside down into the hot glue using a small tool.