I had this plain gray flats, which I bought at Walmart for US$11, they were plain and boring so I decided to bring them to life adding this black and polka doted flower. This y what you need:
Something round a cup will do
Polka dot fabric
2 oversized buttons
Tread and needle
Cover your buttons with the polka dot fabric and cut the fabric according to the button shape paste it. Using the chalk trace circles with your selected round object over the black fabric (you'll need approximately 5 for each shoe)cut them and then fold them in four and saw the ends together paste them to the shoe and apply the covered button to the top and voilà!!!!