Inspired by the Half Blood Price!
Cut out two small circles of yellow felt. Sew the two small circles together but be sure to leave a big enough gap to stuff it with stuffing. Then sew up the small gap thus giving you a nice round yellow ball.
Next cut two wing shapes out of the milk bottle. Then cut four wing shapes out of the white felt. Place one plastic wing between two pieces of white felt and sew the plastic wing inside the white felt (to make the wings rigid). Do that for both of the plastic wings.
Then sew the wings onto the yellow ball you made in step one. And now you have your snitch get ready for quiditch practice!