Well here is the Smoke Lens Cover for the green ninja but it isn't a very good fit. Its not finished yet but I will post a finished picture. I'm going to have to make a few incisions to make it fit perfectly but other than that the light shines threw perfectly and its a very nice material.
Are you using a hair dryer? I used a hair dryer to soften the bottom out a little bit and stretched out all the little wrinkled parts. The edges can be wrinkled and when you fold them down no one will see it