I added large zipper tracts around the baseball skin and used the large zipper pulls to connect to an old purse strap. The larger eye is an old camera filer and the smaller eye piece is a peep hole from a door and a piece of hardware. On one side there are brass clock hands and the other has 3 working plastic gears I painted. All the gears on these goggles are plastic and are from various electronic devices such as hard drives, CD players, DVD players and other things I took apart for another project in the same class.
The little pouch on the back of the strap is the leather case the camera lens filter came in and holds other plastic lenses for the drop down piece. For that piece I used a small piece of a paint stirrer stick, metal hardware and plastic lenses from a flashlight. The red lens has a cross hare drawn on it, for shooting people with, the other colored lenses have no such coolness, however.The whole drop down red lens is a piece of metal hardware screwed into wood, so by twisting it one way, it swings down, and raises back up by twisting it the opposite way.
While I really like these, I was limited in my materials by the parameters of my class. I can't imagine how different they'd be if I could have bought any materials and used anything. But, I rather like them, and they cost about 10$ to make, all in all.