You can maybe take a picture on your computer screen and gently trace it on a piece of paper. Then you can cut out two mirrored pieces of plastic on it (the plastic can be from packaging, soda bottles, take out, and can be what ever thickness you deem fit). Then you could use nail polish or some other way to color them. Another method you could try is to take an image, and trace over it in a drawing program or some program where you can trace and color things then delete the actual image. Then select your wing, make a copy, and then flip it. Then you can print on to a transparency sheet and cut them out
Or you could make them like Hasbro did. Print some wing colors on to transparency sheet and cut them out. Then glue it on the plastic with clear glue. After that is dry cut the plastic and you will have sturdy wings
Adding an extra plastic layer would make the transparency sheet a lot sturdier if you have concerns about that.